ATA 34 NAVIGATION -- Flight instruments

• ED Decision 2020/012/R found in: CS-MMEL Issue 2 - Master Minimum Equipment List (Aug 2020)

ATA 34 NAVIGATION — Flight instruments ED Decision 2020/012/R Summary of the guidance items: <table border="1" cellpadding="0" cellspacing="0" width="607"><tr><td valign="top" width="418"><p><b>Item</b></p></td><td valign="top" width="189"><p><b>ATA</b></p></td></tr><tr><td valign="top" width="418"><p>Primary Airspeed Indication </p></td><td valign="top" width="189"><p>34-10-1</p></td></tr><tr><td valign="top" width="418"><p>Primary Altitude Indication </p></td><td valign="top" width="189"><p>34-10-2</p></td></tr><tr><td valign="top" width="418"><p>Turn and Slip Indicator /Turn Co-ordinators (if installed)</p></td><td valign="top" width="189"><p>34-10-3</p></td></tr><tr><td valign="top" width="418"><p>Vertical Speed Indicator</p></td><td valign="top" width="189"><p>34-10-4</p></td></tr><tr><td valign="top" width="418"><p>OAT Indicator</p></td><td valign="top" width="189"><p>34-10-5</p></td></tr><tr><td valign="top" width="418"><p>Radio Altimeter with an Audio Voice Warning (or equivalent)</p></td><td valign="top" width="189"><p>34-15-2</p></td></tr><tr><td valign="top" width="418"><p>Stabilised direction Indication</p></td><td valign="top" width="189"><p>34-20-1</p></td></tr><tr><td valign="top" width="418"><p>Magnetic/Standby Compass</p></td><td valign="top" width="189"><p>34-22-1</p></td></tr><tr><td valign="top" width="418"><p>Primary Attitude Indication</p></td><td valign="top" width="189"><p>34-20-2</p></td></tr><tr><td valign="top" width="418"><p>Standby Attitude Indication</p></td><td valign="top" width="189"><p>34-20-3</p></td></tr></table> Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="584"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="20"></td></tr><tr><td colspan="6" valign="top" width="584"></td><td valign="top" width="20"></td></tr><tr><td colspan="2" valign="top" width="219"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="219"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="347"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="3" valign="top" width="310"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="82"><p>34-10-1</p></td><td valign="top" width="137"><p>Primary Airspeed Indication</p></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>Note: Standby airspeed indication is not considered as a primary airspeed indication by this guidance.</p></td></tr><tr><td valign="top" width="82"><p>34-10-1A</p></td><td valign="top" width="137"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="37"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="272"><p>(O) May be inoperative provided:</p></td></tr><tr><td valign="top" width="82"></td><td valign="top" width="137"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p align="left">(a) A primary independent airspeed indication is available at each required pilot’s station, and</p><p align="left">(b) Procedures are established and used to cover the loss of primary airspeed indication in-flight.</p></td></tr><tr><td valign="top" width="82"></td><td valign="top" width="137"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>Procedures:</p><p>(O) To provide guidance to the crew for monitoring of erroneous indication and to ensure safe flight in case of the failure in-flight of a primary indication.</p><p>Note: The procedure can be based on the use of a secondary (standby) airspeed indication, if installed.</p></td></tr><tr><td valign="top" width="82"><p>34-10-1B</p></td><td valign="top" width="137"><p>(Helicopters)</p></td><td valign="top" width="37"><p>D</p></td><td valign="top" width="37"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="272"><p>(O) May be inoperative provided:</p></td></tr><tr><td valign="top" width="82"></td><td valign="top" width="137"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p align="left">(a) A primary independent airspeed indication is available at each required pilot’s station, and</p><p align="left">(b) Procedures are established and used to cover the loss of primary airspeed indication in-flight.</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>Procedures:</p><p>(O) To provide guidance to the crew for monitoring of erroneous indication and to ensure safe flight in case of the failure in-flight of a primary indication. </p><p>Note: The procedure can be based on the use of a secondary (standby) airspeed indication, if installed.</p></td></tr><tr><td colspan="2" valign="top" width="219"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="510"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="94"></td></tr><tr><td colspan="6" valign="top" width="510"></td><td valign="top" width="94"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="311"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="85"><p>34-10-1C</p></td><td valign="top" width="135"><p>(Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>1</p></td><td colspan="2" valign="top" width="272"><p>(O) Any in excess of one may be inoperative provided:</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"><p align="left">(a) The primary airspeed indication is available at the handling pilot’s side,</p><p align="left">(b) Flight is conducted by day under VFR,</p><p align="left">(c) Operations are not conducted over water, and</p><p align="left">(d) Procedures are established and used to cover the loss of a primary airspeed indication in-flight.</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"><p>Procedures:</p><p>(O) To provide guidance to the flight crew to ensure safe flight in case of the failure in-flight of a primary indication.</p><p>Note: The procedure can be based on the use of a secondary (standby) airspeed indication, if installed.</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"></td></tr><tr height="0"></tr></table> Additional considerations: The intent of this guidance is to ensure that the remaining indication essential to the safety of flight still satisfies the applicable requirements. Applicable requirements are defined as both the airworthiness standards under which the aircraft was certificated and the operating rules under which it is operated. Relief can therefore be granted for an indication that is provided in excess of the applicable requirements. This may be achieved by the introduction of dispatch conditions to prevent certain kind of operations (e.g. IFR, dual pilot operations). To comply with the applicable requirements, acceptable means other than duplication of instruments/indicators can be foreseen to ensure that sufficient information is available (e.g. switching of sources, speed tapes, etc.). Consequently the guidance refers to primary indication rather than indicators or instruments. Additional clarification may be provided at the level of the aircraft type MMEL. Compliance with airworthiness requirements may lead to the installation of secondary (standby) attitude indication. The above guidance item does not cover such standby airspeed indication. If a standby airspeed indication is required to comply with airworthiness requirements for certification of the aircraft, (e.g. CS-23 with EFIS, CS-25, etc.), no relief can be given unless an acceptable level of safety is demonstrated, on a case-by-case basis, in accordance with CS-MMEL. 34-10-1A: For aircraft fitted with EFIS, the airspeed indicator displays (tape) are considered as the primary airspeed indication and are therefore required at each required pilot station. For single pilot operations, if credit has been taken during the certification, on the availability of the off side primary airspeed indication in order to meet applicable requirements, this may result in additional restrictions. 34-10-1B: Same as 34-10-1A, except for the rectification interval. 34-10-1C: The airspeed indication is less critical for the helicopters to ensure a safe landing further to the loss of airspeed under day VFR overland operations. Dispatch is authorised with one primary airspeed indication left. VFR condition allows departure from field under IMC under special VFR procedures. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="491"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="113"></td></tr><tr><td colspan="6" valign="top" width="491"></td><td valign="top" width="113"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="70"><p>34-10-2</p></td><td valign="top" width="150"><p>Primary Altitude Indication</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: A secondary/standby altitude indication is not considered as a primary altitude indication.</p></td></tr><tr><td valign="top" width="70"><p>34-10-2A</p></td><td valign="top" width="150"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"><p>(Other than commercial air transport operations)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Flight is conducted under VFR, and</p><p align="left">(b) An altitude indication is available at each required pilot’s station.</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: For single pilot operations, a secondary/standby or off-side indication may satisfy condition (b), if visibility requirements are met.</p></td></tr><tr><td valign="top" width="70"><p>34-10-2B</p></td><td valign="top" width="150"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Flight is conducted under VFR,</p><p align="left">(b) An independent altitude indication is available at each required pilot’s station, and</p><p align="left">(c) An additional independent altitude indication is operative for single pilot operations.</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: For single pilot operations, a secondary/standby or off-side indication may satisfy condition (b) or (c), if visibility requirements are met.</p></td></tr><tr><td valign="top" width="70"><p>34-10-2C</p></td><td valign="top" width="150"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Flight is conducted under VMC in sight of the surface, and</p><p align="left">(b) A primary altitude indication is available on pilot flying’s side.</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="529"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="75"></td></tr><tr><td colspan="6" valign="top" width="529"></td><td valign="top" width="75"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"></td></tr><tr><td valign="top" width="86"><p>34-10-2D</p></td><td valign="top" width="134"><p>(Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="275"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="86"></td><td valign="top" width="134"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p align="left">(a) A primary altitude indication is available at the handling pilot’s side, and</p><p align="left">(b) Operations are conducted under day VFR over routes navigated by reference to visual landmarks.</p></td></tr><tr><td valign="top" width="86"><p>34-10-2E</p></td><td valign="top" width="134"><p>(Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="275"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="86"></td><td valign="top" width="134"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p align="left">(a) A primary altitude indication is available at handling pilot’s station, and</p><p align="left">(b) Alternate independent altitude or height indication is operative,</p></td></tr><tr><td valign="top" width="86"></td><td valign="top" width="134"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p>Note: A secondary/standby altitude indication or radio altimeter indication may satisfy condition (b) if visibility requirements are met.</p></td></tr><tr height="0"></tr></table> Additional considerations: Primary Altitude indication should normally be a sensitive pressure altitude indication. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="7" valign="top" width="571"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="32"></td></tr><tr><td colspan="7" valign="top" width="571"></td><td valign="top" width="32"></td></tr><tr><td colspan="3" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="3" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="3" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="3" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="3" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="73"><p><b>34-10-3</b></p></td><td colspan="2" valign="top" width="147"><p><b>Turn and Slip Indicator/ Turn Co-ordinators</b><br/> (if installed)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1</p></td><td valign="top" width="143"><p>Turn Indication </p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1A</p></td><td valign="top" width="143"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative for single pilot operations provided operations are conducted under day VMC.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1B</p></td><td valign="top" width="143"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative for single pilot operations provided standby attitude indication is operative.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1C</p></td><td valign="top" width="143"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided three independent attitude indications are operative</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1D</p></td><td valign="top" width="143"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td colspan="2" valign="top" width="77"></td><td valign="top" width="143"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) The operative turn indication is on the pilot-in-command station, and</p><p align="left">(b) Primary attitude indications are operative at required pilot’s station.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1E</p></td><td valign="top" width="143"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td colspan="2" valign="top" width="77"></td><td valign="top" width="143"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under day VMC, and</p><p align="left">(b) Primary attitude indications are operative at required pilot’s station.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-2</p></td><td valign="top" width="143"><p>Slip/Skid Indication</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-2A</p></td><td valign="top" width="143"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative provided the operative slip/skid indication is on the pilot’s-in-command station.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-2A</p></td><td valign="top" width="143"><p>(Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided: </p></td></tr><tr><td colspan="2" valign="top" width="77"></td><td valign="top" width="143"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR over routes navigated by reference to visual landmarks, and</p><p align="left">(b) Operations are not conducted over water.</p></td></tr><tr height="0"></tr></table> Additional considerations: Turn indication entry may apply to equivalent indication displayed as part of an integrated system. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="482"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="122"></td></tr><tr><td colspan="6" valign="top" width="482"></td><td valign="top" width="122"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"><p>34-10-4</p></td><td valign="top" width="140"><p>Vertical Speed Indication </p><p>(VSI)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"><p>34-10-4A</p></td><td valign="top" width="140"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative provided the operative VSI is on the pilot’s -in-command side.</p></td></tr><tr><td valign="top" width="80"><p>34-10-4B</p></td><td valign="top" width="140"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative for operations under day VMC provided procedures do not require = its use.</p></td></tr><tr><td valign="top" width="80"><p>34-10-4C</p></td><td valign="top" width="140"><p>(Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative provided the operative VSI is on the pilot’s -in-command side.</p></td></tr><tr><td valign="top" width="80"><p>34-10-4D</p></td><td valign="top" width="140"><p>(Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative for operations under day VFR over routes navigated by reference to visual landmarks. </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr height="0"></tr></table> Additional considerations: N/A Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="505"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="98"></td></tr><tr><td colspan="6" valign="top" width="505"></td><td valign="top" width="98"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>Item</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="94"><p>34-10-5</p></td><td valign="top" width="125"><p>OAT Indicator</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="94"><p>34-10-5A</p></td><td valign="top" width="125"></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>(O) May be inoperative provided another air temperature indication is operative that is convertible to OAT.</p></td></tr><tr><td valign="top" width="94"></td><td valign="top" width="125"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="94"></td><td valign="top" width="125"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Procedures:</p><p>(O) To provide guidance to the crew to convert the alternate temperature indication in OAT, as required.</p></td></tr><tr height="0"></tr></table> Additional considerations: Further relief might be granted for non-commercial operations, short -range flights or when the OAT indicator is not required by the certification basis (e.g. CS-27). Aircraft applicability: Aeroplanes <table border="1" cellpadding="0" cellspacing="0" width="605"><tr><td colspan="6" valign="top" width="491"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="113"><p>PAGE: 34-x</p></td></tr><tr><td colspan="6" valign="top" width="491"></td><td valign="top" width="113"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="347"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="313"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="85"><p>34-15-1</p></td><td valign="top" width="135"><p>Altitude Alerting System</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="85"><p>34-15-1A</p></td><td valign="top" width="135"></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="274"><p>(O) May be inoperative provided: </p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"><p align="left">(a) An autopilot with an altitude hold is operative,</p><p align="left">(b) Alternate procedures are established and used, and</p><p align="left">(c) The altitude alerting system is not part of the equipment required for the intended operation.</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"><p>Procedures</p><p>(O) To provide alternate operational procedures to the flight crew, if applicable.</p><p>(O) To specify any applicable restriction for operations requiring a specific approval. </p></td></tr><tr height="0"></tr></table> Additional considerations: RVSM restrictions may apply. One altitude alerting system is required to be operative for RVSM operations. Rectification interval C may be considered for other than turbo-jet aeroplanes. These aircraft may not have an autopilot installed in which case the autopilot would not be a condition of relief. Aircraft applicability: Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="501"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="103"></td></tr><tr><td colspan="6" valign="top" width="501"></td><td valign="top" width="103"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td colspan="3" valign="top" width="310"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="71"><p>34-15-2</p></td><td valign="top" width="149"><p>Radio Altimeter with an Audio Voice Warning</p><p>(or equivalent)</p></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="71"></td><td valign="top" width="149"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="71"><p>34-15-2A</p></td><td valign="top" width="149"></td><td valign="top" width="37"><p>A</p></td><td valign="top" width="36"><p>-</p></td><td valign="top" width="35"><p>0</p></td><td colspan="2" valign="top" width="274"><p>(O) May be inoperative provided: </p></td></tr><tr><td valign="top" width="71"></td><td valign="top" width="149"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"><p align="left">(a) No more than 6 hours shall be flown over water since the radio altimeter was found to be inoperative,</p><p align="left">(b) A maximum of 24 hours have elapsed since the radio altimeter was found to be inoperative,</p><p align="left">(c) The helicopter shall not fly over water at an altitude of less than 500 feet except for take-off and landing, and</p><p align="left">(d) The helicopter shall not descend below 500 feet on approach to landing over water unless the landing site is clearly visible to the pilot.</p></td></tr><tr><td valign="top" width="71"></td><td valign="top" width="149"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"><p>Procedures</p><p>(O) To provide operational procedures to the flight crew to ensure that applicable dispatch conditions are satisfied.</p></td></tr><tr height="0"></tr></table> Additional considerations: In addition to the equipment required by CAT.IDE.H.145, helicopter involved in NVIS operations shall be equipped with a radio altimeter and a low height warning system giving visual and audio warnings selectable by the pilot and discernible during NVIS operation. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="498"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="105"></td></tr><tr><td colspan="6" valign="top" width="498"></td><td valign="top" width="105"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="383"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="39"></td><td colspan="4" valign="top" width="343"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="309"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="75"><p>34-20-1</p></td><td valign="top" width="145"><p>Stabilised Direction Indication</p></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="75"><p>34-20-1A</p></td><td valign="top" width="145"><p>(Aeroplanes other than commercial air transport operations &amp; Helicopters)</p></td><td valign="top" width="39"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="272"><p>May be inoperative provided:</p><p align="left">(a) a stabilised direction indication is operative on the pilot’s-in-command side, and</p><p align="left">(b) Magnetic/standby compass is operative,</p></td></tr><tr><td valign="top" width="75"><p>34-20-1B</p></td><td valign="top" width="145"><p>(Aeroplanes)</p></td><td valign="top" width="39"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="272"><p>May be inoperative for single pilot operations provided:</p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) A stabilised direction indication is operative on the pilot’s-in-command side,</p><p align="left">(c) Magnetic/standby compass is operative.</p></td></tr><tr><td valign="top" width="75"><p>34-20-1C</p></td><td valign="top" width="145"><p>(Aeroplanes)</p></td><td valign="top" width="39"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>2</p></td><td colspan="2" valign="top" width="272"><p>May be inoperative provided an independent stabilised direction indication is operative at each required pilot’s station.</p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p>Note: A standby heading indication cannot be considered to meet the above dispatch conditions.</p></td></tr><tr><td valign="top" width="75"><p>34-20-1D</p></td><td valign="top" width="145"><p>(Aeroplanes)</p></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="272"><p>(O) May be inoperative provided: </p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) The stabilised direction indication is displayed at each required pilot’s station, and</p><p align="left">(c) Magnetic/standby compass is operative.</p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p><b>Procedures:</b></p><p>(O) To provide switching procedure to the flight crew to ensure adequate configuration of the displays in accordance with the above condition (b)</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="571"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="31"></td></tr><tr><td colspan="6" valign="top" width="571"></td><td valign="top" width="31"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="383"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="345"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="310"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"></td></tr><tr><td valign="top" width="78"><p>34-20-1E</p></td><td valign="top" width="142"><p>(Helicopters with MCTOM &lt; 3 175 kg)</p></td><td valign="top" width="37"><p>A</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>0</p></td><td colspan="2" valign="top" width="273"><p>May be inoperative for a maximum of 5 flights provided: </p></td></tr><tr><td valign="top" width="78"></td><td valign="top" width="142"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"><p>(a) The operations are conducted under day VFR, and</p><p>(b) The operations are not conducted over water out of sight of land or with a visibility less than 1 500 m, and</p><p>(c) A non-stabilised direction indication (e.g. magnetic/standby compass) is operative.</p></td></tr><tr><td valign="top" width="78"></td><td valign="top" width="142"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"></td></tr><tr height="0"></tr></table> Additional considerations: 34-20-1C System architecture and functional integration should be considered in determining additional relief or restrictions. If electronic flight deck displays are installed, a review of the failure conditions involving loss of heading displays and display of misleading heading information should be conducted in accordance with CS-MMEL 145 prior to considering using this guidance. 34-20-1D Relief can be considered for night VFR and IFR operations based on a case-by-case evaluation and in accordance with CS-MMEL requirements. Justifications may take advantage of available equipment providing stabilised direction indication or equivalent (e.g. GPS track). Whenever independent stabilised direction indication is required for dispatch, compliance is ensured by the availability of independent sources (e.g. stabilised gyros) and so that no single failure can lead to the loss of both heading indications. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="559"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="43"></td></tr><tr><td colspan="6" valign="top" width="559"></td><td valign="top" width="43"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="383"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="39"></td><td colspan="4" valign="top" width="343"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="309"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"></td></tr><tr><td valign="top" width="80"><p><b>34-22-1</b></p></td><td valign="top" width="140"><p><b>Magnetic/Standby compass</b></p></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"></td></tr><tr><td valign="top" width="80"><p>34-22-1A</p></td><td valign="top" width="140"></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative for single pilot operations provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) A stabilised direction indication is operative on the pilot’s-in-command side, and</p><p align="left">(c) Another source of magnetic heading is available and visible by the pilot-in-command.</p></td></tr><tr><td valign="top" width="80"><p>34-22-1B</p></td><td valign="top" width="140"></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) Two independent stabilised direction indications are operative.</p></td></tr><tr><td valign="top" width="80"><p>34-22-1C</p></td><td valign="top" width="140"></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative provided:</p><p align="left">a) Two independent stabilised direction indications are operative, and</p><p align="left">b) Another source of magnetic heading is available and visible by the pilot-in-command.</p></td></tr><tr><td valign="top" width="80"><p>34-22-1D</p></td><td valign="top" width="140"><p>(Helicopters)</p></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) Two independent stabilised direction indications are operative.</p></td></tr><tr height="0"></tr></table> Additional considerations: Relief can be considered for night VFR and IFR operations based on a case-by-case evaluation and in accordance with CS-MMEL requirements. Justifications may take advantage of available equipment providing stabilised direction indication or equivalent (e.g. GPS track). Whenever independent stabilised direction indications are required for dispatch, compliance is ensured by the availability of independent sources (e.g. stabilised gyros) so that no single failure can lead to the loss of both heading indications. The two independent stabilised direction indicator systems may be achieved by any combination of two gyroscopic or INS (IRU) stabilised compass systems. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="605"><tr><td colspan="6" valign="top" width="497"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="107"></td></tr><tr><td colspan="6" valign="top" width="497"></td><td valign="top" width="107"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="347"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"><p><b>34-20-2</b></p></td><td valign="top" width="140"><p><b>Primary Attitude Indication</b></p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: A secondary/standby attitude indication is not considered as a primary indication.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2A</p></td><td valign="top" width="140"><p>(Aeroplanes for other than CAT operations)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) Standby attitude indication is operative.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2B</p></td><td valign="top" width="140"><p>(Helicopters for other than CAT operations)</p></td><td valign="top" width="37"><p>D</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided operations are conducted under day VFR.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2C</p></td><td valign="top" width="140"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative for single pilot operations provided: </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted in day VMC in sight of the surface with adequate external attitude reference, and</p><p align="left">(b) The primary attitude indication is operative on the pilot’s-in-command side, and</p><p align="left">(c) Standby attitude indication is operative.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2D</p></td><td valign="top" width="140"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>2</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of two may be inoperative provided: </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) An independent primary attitude indication is operative at each required pilot’s station</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: A secondary/standby indication cannot satisfy the above condition (b).</p></td></tr><tr><td valign="top" width="80"><p>34-20-2E</p></td><td valign="top" width="140"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>(O) Any in excess of one may be inoperative provided: </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) The primary attitude indication is displayed on both pilot’s stations, and</p><p align="left">(c) Standby attitude indication is operative.</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p><b>Procedures:</b></p><p>(O) To provide switching procedure to the crew to ensure adequate configuration of the displays in accordance with the above condition (b)</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="491"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="111"></td></tr><tr><td colspan="6" valign="top" width="491"></td><td valign="top" width="111"></td></tr><tr><td colspan="2" valign="top" width="221"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="382"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="221"><p>ITEM</p></td><td valign="top" width="38"></td><td colspan="4" valign="top" width="343"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="221"></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="308"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="221"><p> (continued)</p></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="221"></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"></td></tr><tr><td valign="top" width="76"><p>34-20-2F</p></td><td valign="top" width="146"><p>(Aeroplanes)</p><p>(Single pilot)</p></td><td valign="top" width="38"><p>A</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative for single pilot operations only for a maximum of 2 calendar days provided: </p></td></tr><tr><td valign="top" width="76"></td><td valign="top" width="146"></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"><p align="left">(a) Operations are conducted under day VMC in sight of the surface with adequate external attitude reference, and</p><p align="left">(b) A standby attitude indication is installed and operative.</p></td></tr><tr><td valign="top" width="76"><p>34-20-2G</p></td><td valign="top" width="146"><p>(Helicopters with MCTOM &lt; 3 175 kg)</p></td><td valign="top" width="38"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative provided:</p><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) Operations are not conducted over water out of sight of the land, and</p><p align="left">(c) Visibility is more than 1 500 m.</p></td></tr><tr><td valign="top" width="76"><p>34-20-3</p></td><td valign="top" width="146"><p>Standby Attitude Indication</p></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"></td></tr><tr><td valign="top" width="76"><p>34-20-3A</p></td><td valign="top" width="146"><p>(Other than commercial air transport operations)</p></td><td valign="top" width="38"><p>D</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative provided flight is conducted under VMC with a visual horizon.</p></td></tr><tr><td valign="top" width="76"><p>34-20-3B</p></td><td valign="top" width="146"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="38"><p>B</p></td><td valign="top" width="35"><p>- </p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative provided flight is conducted under day VMC with a visual horizon.</p></td></tr><tr height="0"></tr></table> Additional considerations: 34-20-2F: Prior to allowing dispatch without any attitude indication, a review of the certification requirements as well as the handling qualities and training of the flight crew is required. 34-20-3A & B Standby attitude indication: If the standby attitude indicator is needed to meet the applicable requirements (e.g. CS-23.2500 Electronic Flight Display or CS-25.1309) relief may not be granted for operations under IFR or at night. Case-by-case evaluations are, however, possible, based on the applicable CS-MMEL requirements. The VMC with a visual horizon limitation prohibits ‘VFR on top’ or ‘VFR over-the-top’ operations. Issue No: MMEL/2 ATA 34 NAVIGATION — Flight instruments ED Decision 2020/012/R Summary of the guidance items: <table border="1" cellpadding="0" cellspacing="0" width="607"><tr><td valign="top" width="418"><p><b>Item</b></p></td><td valign="top" width="189"><p><b>ATA</b></p></td></tr><tr><td valign="top" width="418"><p>Primary Airspeed Indication </p></td><td valign="top" width="189"><p>34-10-1</p></td></tr><tr><td valign="top" width="418"><p>Primary Altitude Indication </p></td><td valign="top" width="189"><p>34-10-2</p></td></tr><tr><td valign="top" width="418"><p>Turn and Slip Indicator /Turn Co-ordinators (if installed)</p></td><td valign="top" width="189"><p>34-10-3</p></td></tr><tr><td valign="top" width="418"><p>Vertical Speed Indicator</p></td><td valign="top" width="189"><p>34-10-4</p></td></tr><tr><td valign="top" width="418"><p>OAT Indicator</p></td><td valign="top" width="189"><p>34-10-5</p></td></tr><tr><td valign="top" width="418"><p>Radio Altimeter with an Audio Voice Warning (or equivalent)</p></td><td valign="top" width="189"><p>34-15-2</p></td></tr><tr><td valign="top" width="418"><p>Stabilised direction Indication</p></td><td valign="top" width="189"><p>34-20-1</p></td></tr><tr><td valign="top" width="418"><p>Magnetic/Standby Compass</p></td><td valign="top" width="189"><p>34-22-1</p></td></tr><tr><td valign="top" width="418"><p>Primary Attitude Indication</p></td><td valign="top" width="189"><p>34-20-2</p></td></tr><tr><td valign="top" width="418"><p>Standby Attitude Indication</p></td><td valign="top" width="189"><p>34-20-3</p></td></tr></table> Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="584"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="20"></td></tr><tr><td colspan="6" valign="top" width="584"></td><td valign="top" width="20"></td></tr><tr><td colspan="2" valign="top" width="219"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="219"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="347"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="3" valign="top" width="310"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="82"><p>34-10-1</p></td><td valign="top" width="137"><p>Primary Airspeed Indication</p></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>Note: Standby airspeed indication is not considered as a primary airspeed indication by this guidance.</p></td></tr><tr><td valign="top" width="82"><p>34-10-1A</p></td><td valign="top" width="137"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="37"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="272"><p>(O) May be inoperative provided:</p></td></tr><tr><td valign="top" width="82"></td><td valign="top" width="137"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p align="left">(a) A primary independent airspeed indication is available at each required pilot’s station, and</p><p align="left">(b) Procedures are established and used to cover the loss of primary airspeed indication in-flight.</p></td></tr><tr><td valign="top" width="82"></td><td valign="top" width="137"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>Procedures:</p><p>(O) To provide guidance to the crew for monitoring of erroneous indication and to ensure safe flight in case of the failure in-flight of a primary indication.</p><p>Note: The procedure can be based on the use of a secondary (standby) airspeed indication, if installed.</p></td></tr><tr><td valign="top" width="82"><p>34-10-1B</p></td><td valign="top" width="137"><p>(Helicopters)</p></td><td valign="top" width="37"><p>D</p></td><td valign="top" width="37"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="272"><p>(O) May be inoperative provided:</p></td></tr><tr><td valign="top" width="82"></td><td valign="top" width="137"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p align="left">(a) A primary independent airspeed indication is available at each required pilot’s station, and</p><p align="left">(b) Procedures are established and used to cover the loss of primary airspeed indication in-flight.</p></td></tr><tr><td colspan="2" valign="top" width="219"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"><p>Procedures:</p><p>(O) To provide guidance to the crew for monitoring of erroneous indication and to ensure safe flight in case of the failure in-flight of a primary indication. </p><p>Note: The procedure can be based on the use of a secondary (standby) airspeed indication, if installed.</p></td></tr><tr><td colspan="2" valign="top" width="219"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="272"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="510"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="94"></td></tr><tr><td colspan="6" valign="top" width="510"></td><td valign="top" width="94"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="311"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="85"><p>34-10-1C</p></td><td valign="top" width="135"><p>(Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>1</p></td><td colspan="2" valign="top" width="272"><p>(O) Any in excess of one may be inoperative provided:</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"><p align="left">(a) The primary airspeed indication is available at the handling pilot’s side,</p><p align="left">(b) Flight is conducted by day under VFR,</p><p align="left">(c) Operations are not conducted over water, and</p><p align="left">(d) Procedures are established and used to cover the loss of a primary airspeed indication in-flight.</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"><p>Procedures:</p><p>(O) To provide guidance to the flight crew to ensure safe flight in case of the failure in-flight of a primary indication.</p><p>Note: The procedure can be based on the use of a secondary (standby) airspeed indication, if installed.</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="272"></td></tr><tr height="0"></tr></table> Additional considerations: The intent of this guidance is to ensure that the remaining indication essential to the safety of flight still satisfies the applicable requirements. Applicable requirements are defined as both the airworthiness standards under which the aircraft was certificated and the operating rules under which it is operated. Relief can therefore be granted for an indication that is provided in excess of the applicable requirements. This may be achieved by the introduction of dispatch conditions to prevent certain kind of operations (e.g. IFR, dual pilot operations). To comply with the applicable requirements, acceptable means other than duplication of instruments/indicators can be foreseen to ensure that sufficient information is available (e.g. switching of sources, speed tapes, etc.). Consequently the guidance refers to primary indication rather than indicators or instruments. Additional clarification may be provided at the level of the aircraft type MMEL. Compliance with airworthiness requirements may lead to the installation of secondary (standby) attitude indication. The above guidance item does not cover such standby airspeed indication. If a standby airspeed indication is required to comply with airworthiness requirements for certification of the aircraft, (e.g. CS-23 with EFIS, CS-25, etc.), no relief can be given unless an acceptable level of safety is demonstrated, on a case-by-case basis, in accordance with CS-MMEL. 34-10-1A: For aircraft fitted with EFIS, the airspeed indicator displays (tape) are considered as the primary airspeed indication and are therefore required at each required pilot station. For single pilot operations, if credit has been taken during the certification, on the availability of the off side primary airspeed indication in order to meet applicable requirements, this may result in additional restrictions. 34-10-1B: Same as 34-10-1A, except for the rectification interval. 34-10-1C: The airspeed indication is less critical for the helicopters to ensure a safe landing further to the loss of airspeed under day VFR overland operations. Dispatch is authorised with one primary airspeed indication left. VFR condition allows departure from field under IMC under special VFR procedures. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="491"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="113"></td></tr><tr><td colspan="6" valign="top" width="491"></td><td valign="top" width="113"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="70"><p>34-10-2</p></td><td valign="top" width="150"><p>Primary Altitude Indication</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: A secondary/standby altitude indication is not considered as a primary altitude indication.</p></td></tr><tr><td valign="top" width="70"><p>34-10-2A</p></td><td valign="top" width="150"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"><p>(Other than commercial air transport operations)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Flight is conducted under VFR, and</p><p align="left">(b) An altitude indication is available at each required pilot’s station.</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: For single pilot operations, a secondary/standby or off-side indication may satisfy condition (b), if visibility requirements are met.</p></td></tr><tr><td valign="top" width="70"><p>34-10-2B</p></td><td valign="top" width="150"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>-</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Flight is conducted under VFR,</p><p align="left">(b) An independent altitude indication is available at each required pilot’s station, and</p><p align="left">(c) An additional independent altitude indication is operative for single pilot operations.</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: For single pilot operations, a secondary/standby or off-side indication may satisfy condition (b) or (c), if visibility requirements are met.</p></td></tr><tr><td valign="top" width="70"><p>34-10-2C</p></td><td valign="top" width="150"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="70"></td><td valign="top" width="150"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Flight is conducted under VMC in sight of the surface, and</p><p align="left">(b) A primary altitude indication is available on pilot flying’s side.</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="604"><tr><td colspan="6" valign="top" width="529"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="75"></td></tr><tr><td colspan="6" valign="top" width="529"></td><td valign="top" width="75"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"></td></tr><tr><td valign="top" width="86"><p>34-10-2D</p></td><td valign="top" width="134"><p>(Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="275"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="86"></td><td valign="top" width="134"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p align="left">(a) A primary altitude indication is available at the handling pilot’s side, and</p><p align="left">(b) Operations are conducted under day VFR over routes navigated by reference to visual landmarks.</p></td></tr><tr><td valign="top" width="86"><p>34-10-2E</p></td><td valign="top" width="134"><p>(Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="275"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="86"></td><td valign="top" width="134"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p align="left">(a) A primary altitude indication is available at handling pilot’s station, and</p><p align="left">(b) Alternate independent altitude or height indication is operative,</p></td></tr><tr><td valign="top" width="86"></td><td valign="top" width="134"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="275"><p>Note: A secondary/standby altitude indication or radio altimeter indication may satisfy condition (b) if visibility requirements are met.</p></td></tr><tr height="0"></tr></table> Additional considerations: Primary Altitude indication should normally be a sensitive pressure altitude indication. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="7" valign="top" width="571"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="32"></td></tr><tr><td colspan="7" valign="top" width="571"></td><td valign="top" width="32"></td></tr><tr><td colspan="3" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="3" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="3" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="3" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="3" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="73"><p><b>34-10-3</b></p></td><td colspan="2" valign="top" width="147"><p><b>Turn and Slip Indicator/ Turn Co-ordinators</b><br/> (if installed)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1</p></td><td valign="top" width="143"><p>Turn Indication </p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1A</p></td><td valign="top" width="143"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative for single pilot operations provided operations are conducted under day VMC.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1B</p></td><td valign="top" width="143"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative for single pilot operations provided standby attitude indication is operative.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1C</p></td><td valign="top" width="143"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided three independent attitude indications are operative</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1D</p></td><td valign="top" width="143"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td colspan="2" valign="top" width="77"></td><td valign="top" width="143"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) The operative turn indication is on the pilot-in-command station, and</p><p align="left">(b) Primary attitude indications are operative at required pilot’s station.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-1E</p></td><td valign="top" width="143"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td colspan="2" valign="top" width="77"></td><td valign="top" width="143"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under day VMC, and</p><p align="left">(b) Primary attitude indications are operative at required pilot’s station.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-2</p></td><td valign="top" width="143"><p>Slip/Skid Indication</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-2A</p></td><td valign="top" width="143"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative provided the operative slip/skid indication is on the pilot’s-in-command station.</p></td></tr><tr><td colspan="2" valign="top" width="77"><p>34-10-3-2A</p></td><td valign="top" width="143"><p>(Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided: </p></td></tr><tr><td colspan="2" valign="top" width="77"></td><td valign="top" width="143"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR over routes navigated by reference to visual landmarks, and</p><p align="left">(b) Operations are not conducted over water.</p></td></tr><tr height="0"></tr></table> Additional considerations: Turn indication entry may apply to equivalent indication displayed as part of an integrated system. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="482"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="122"></td></tr><tr><td colspan="6" valign="top" width="482"></td><td valign="top" width="122"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"><p>34-10-4</p></td><td valign="top" width="140"><p>Vertical Speed Indication </p><p>(VSI)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"><p>34-10-4A</p></td><td valign="top" width="140"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative provided the operative VSI is on the pilot’s -in-command side.</p></td></tr><tr><td valign="top" width="80"><p>34-10-4B</p></td><td valign="top" width="140"><p>(Aeroplanes)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative for operations under day VMC provided procedures do not require = its use.</p></td></tr><tr><td valign="top" width="80"><p>34-10-4C</p></td><td valign="top" width="140"><p>(Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative provided the operative VSI is on the pilot’s -in-command side.</p></td></tr><tr><td valign="top" width="80"><p>34-10-4D</p></td><td valign="top" width="140"><p>(Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative for operations under day VFR over routes navigated by reference to visual landmarks. </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr height="0"></tr></table> Additional considerations: N/A Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="505"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="98"></td></tr><tr><td colspan="6" valign="top" width="505"></td><td valign="top" width="98"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>Item</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="94"><p>34-10-5</p></td><td valign="top" width="125"><p>OAT Indicator</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="94"><p>34-10-5A</p></td><td valign="top" width="125"></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>(O) May be inoperative provided another air temperature indication is operative that is convertible to OAT.</p></td></tr><tr><td valign="top" width="94"></td><td valign="top" width="125"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="94"></td><td valign="top" width="125"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Procedures:</p><p>(O) To provide guidance to the crew to convert the alternate temperature indication in OAT, as required.</p></td></tr><tr height="0"></tr></table> Additional considerations: Further relief might be granted for non-commercial operations, short -range flights or when the OAT indicator is not required by the certification basis (e.g. CS-27). Aircraft applicability: Aeroplanes <table border="1" cellpadding="0" cellspacing="0" width="605"><tr><td colspan="6" valign="top" width="491"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="113"><p>PAGE: 34-x</p></td></tr><tr><td colspan="6" valign="top" width="491"></td><td valign="top" width="113"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="347"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="313"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="85"><p>34-15-1</p></td><td valign="top" width="135"><p>Altitude Alerting System</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="85"><p>34-15-1A</p></td><td valign="top" width="135"></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="274"><p>(O) May be inoperative provided: </p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"><p align="left">(a) An autopilot with an altitude hold is operative,</p><p align="left">(b) Alternate procedures are established and used, and</p><p align="left">(c) The altitude alerting system is not part of the equipment required for the intended operation.</p></td></tr><tr><td valign="top" width="85"></td><td valign="top" width="135"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="274"><p>Procedures</p><p>(O) To provide alternate operational procedures to the flight crew, if applicable.</p><p>(O) To specify any applicable restriction for operations requiring a specific approval. </p></td></tr><tr height="0"></tr></table> Additional considerations: RVSM restrictions may apply. One altitude alerting system is required to be operative for RVSM operations. Rectification interval C may be considered for other than turbo-jet aeroplanes. These aircraft may not have an autopilot installed in which case the autopilot would not be a condition of relief. Aircraft applicability: Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="501"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="103"></td></tr><tr><td colspan="6" valign="top" width="501"></td><td valign="top" width="103"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="346"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td colspan="3" valign="top" width="310"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="71"><p>34-15-2</p></td><td valign="top" width="149"><p>Radio Altimeter with an Audio Voice Warning</p><p>(or equivalent)</p></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="71"></td><td valign="top" width="149"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="71"><p>34-15-2A</p></td><td valign="top" width="149"></td><td valign="top" width="37"><p>A</p></td><td valign="top" width="36"><p>-</p></td><td valign="top" width="35"><p>0</p></td><td colspan="2" valign="top" width="274"><p>(O) May be inoperative provided: </p></td></tr><tr><td valign="top" width="71"></td><td valign="top" width="149"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"><p align="left">(a) No more than 6 hours shall be flown over water since the radio altimeter was found to be inoperative,</p><p align="left">(b) A maximum of 24 hours have elapsed since the radio altimeter was found to be inoperative,</p><p align="left">(c) The helicopter shall not fly over water at an altitude of less than 500 feet except for take-off and landing, and</p><p align="left">(d) The helicopter shall not descend below 500 feet on approach to landing over water unless the landing site is clearly visible to the pilot.</p></td></tr><tr><td valign="top" width="71"></td><td valign="top" width="149"></td><td valign="top" width="37"></td><td valign="top" width="36"></td><td valign="top" width="35"></td><td colspan="2" valign="top" width="274"><p>Procedures</p><p>(O) To provide operational procedures to the flight crew to ensure that applicable dispatch conditions are satisfied.</p></td></tr><tr height="0"></tr></table> Additional considerations: In addition to the equipment required by CAT.IDE.H.145, helicopter involved in NVIS operations shall be equipped with a radio altimeter and a low height warning system giving visual and audio warnings selectable by the pilot and discernible during NVIS operation. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="498"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="105"></td></tr><tr><td colspan="6" valign="top" width="498"></td><td valign="top" width="105"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="383"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="39"></td><td colspan="4" valign="top" width="343"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="309"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="75"><p>34-20-1</p></td><td valign="top" width="145"><p>Stabilised Direction Indication</p></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"></td></tr><tr><td valign="top" width="75"><p>34-20-1A</p></td><td valign="top" width="145"><p>(Aeroplanes other than commercial air transport operations &amp; Helicopters)</p></td><td valign="top" width="39"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="272"><p>May be inoperative provided:</p><p align="left">(a) a stabilised direction indication is operative on the pilot’s-in-command side, and</p><p align="left">(b) Magnetic/standby compass is operative,</p></td></tr><tr><td valign="top" width="75"><p>34-20-1B</p></td><td valign="top" width="145"><p>(Aeroplanes)</p></td><td valign="top" width="39"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="272"><p>May be inoperative for single pilot operations provided:</p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) A stabilised direction indication is operative on the pilot’s-in-command side,</p><p align="left">(c) Magnetic/standby compass is operative.</p></td></tr><tr><td valign="top" width="75"><p>34-20-1C</p></td><td valign="top" width="145"><p>(Aeroplanes)</p></td><td valign="top" width="39"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>2</p></td><td colspan="2" valign="top" width="272"><p>May be inoperative provided an independent stabilised direction indication is operative at each required pilot’s station.</p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p>Note: A standby heading indication cannot be considered to meet the above dispatch conditions.</p></td></tr><tr><td valign="top" width="75"><p>34-20-1D</p></td><td valign="top" width="145"><p>(Aeroplanes)</p></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>1</p></td><td colspan="2" valign="top" width="272"><p>(O) May be inoperative provided: </p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) The stabilised direction indication is displayed at each required pilot’s station, and</p><p align="left">(c) Magnetic/standby compass is operative.</p></td></tr><tr><td valign="top" width="75"></td><td valign="top" width="145"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"><p><b>Procedures:</b></p><p>(O) To provide switching procedure to the flight crew to ensure adequate configuration of the displays in accordance with the above condition (b)</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="272"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="571"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="31"></td></tr><tr><td colspan="6" valign="top" width="571"></td><td valign="top" width="31"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="383"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="345"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="310"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"></td></tr><tr><td valign="top" width="78"><p>34-20-1E</p></td><td valign="top" width="142"><p>(Helicopters with MCTOM &lt; 3 175 kg)</p></td><td valign="top" width="37"><p>A</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="36"><p>0</p></td><td colspan="2" valign="top" width="273"><p>May be inoperative for a maximum of 5 flights provided: </p></td></tr><tr><td valign="top" width="78"></td><td valign="top" width="142"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"><p>(a) The operations are conducted under day VFR, and</p><p>(b) The operations are not conducted over water out of sight of land or with a visibility less than 1 500 m, and</p><p>(c) A non-stabilised direction indication (e.g. magnetic/standby compass) is operative.</p></td></tr><tr><td valign="top" width="78"></td><td valign="top" width="142"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="36"></td><td colspan="2" valign="top" width="273"></td></tr><tr height="0"></tr></table> Additional considerations: 34-20-1C System architecture and functional integration should be considered in determining additional relief or restrictions. If electronic flight deck displays are installed, a review of the failure conditions involving loss of heading displays and display of misleading heading information should be conducted in accordance with CS-MMEL 145 prior to considering using this guidance. 34-20-1D Relief can be considered for night VFR and IFR operations based on a case-by-case evaluation and in accordance with CS-MMEL requirements. Justifications may take advantage of available equipment providing stabilised direction indication or equivalent (e.g. GPS track). Whenever independent stabilised direction indication is required for dispatch, compliance is ensured by the availability of independent sources (e.g. stabilised gyros) and so that no single failure can lead to the loss of both heading indications. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="559"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="43"></td></tr><tr><td colspan="6" valign="top" width="559"></td><td valign="top" width="43"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="383"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="39"></td><td colspan="4" valign="top" width="343"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="309"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"></td></tr><tr><td valign="top" width="80"><p><b>34-22-1</b></p></td><td valign="top" width="140"><p><b>Magnetic/Standby compass</b></p></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"></td></tr><tr><td valign="top" width="80"><p>34-22-1A</p></td><td valign="top" width="140"></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative for single pilot operations provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) A stabilised direction indication is operative on the pilot’s-in-command side, and</p><p align="left">(c) Another source of magnetic heading is available and visible by the pilot-in-command.</p></td></tr><tr><td valign="top" width="80"><p>34-22-1B</p></td><td valign="top" width="140"></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) Two independent stabilised direction indications are operative.</p></td></tr><tr><td valign="top" width="80"><p>34-22-1C</p></td><td valign="top" width="140"></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative provided:</p><p align="left">a) Two independent stabilised direction indications are operative, and</p><p align="left">b) Another source of magnetic heading is available and visible by the pilot-in-command.</p></td></tr><tr><td valign="top" width="80"><p>34-22-1D</p></td><td valign="top" width="140"><p>(Helicopters)</p></td><td valign="top" width="39"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="271"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="39"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="271"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) Two independent stabilised direction indications are operative.</p></td></tr><tr height="0"></tr></table> Additional considerations: Relief can be considered for night VFR and IFR operations based on a case-by-case evaluation and in accordance with CS-MMEL requirements. Justifications may take advantage of available equipment providing stabilised direction indication or equivalent (e.g. GPS track). Whenever independent stabilised direction indications are required for dispatch, compliance is ensured by the availability of independent sources (e.g. stabilised gyros) so that no single failure can lead to the loss of both heading indications. The two independent stabilised direction indicator systems may be achieved by any combination of two gyroscopic or INS (IRU) stabilised compass systems. Aircraft applicability: Aeroplanes & Helicopters <table border="1" cellpadding="0" cellspacing="0" width="605"><tr><td colspan="6" valign="top" width="497"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="107"></td></tr><tr><td colspan="6" valign="top" width="497"></td><td valign="top" width="107"></td></tr><tr><td colspan="2" valign="top" width="220"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="384"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="220"><p>ITEM</p></td><td valign="top" width="37"></td><td colspan="4" valign="top" width="347"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="312"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="220"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr><td valign="top" width="80"><p><b>34-20-2</b></p></td><td valign="top" width="140"><p><b>Primary Attitude Indication</b></p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: A secondary/standby attitude indication is not considered as a primary indication.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2A</p></td><td valign="top" width="140"><p>(Aeroplanes for other than CAT operations)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided:</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) Standby attitude indication is operative.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2B</p></td><td valign="top" width="140"><p>(Helicopters for other than CAT operations)</p></td><td valign="top" width="37"><p>D</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>0</p></td><td colspan="2" valign="top" width="274"><p>May be inoperative provided operations are conducted under day VFR.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2C</p></td><td valign="top" width="140"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of one may be inoperative for single pilot operations provided: </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted in day VMC in sight of the surface with adequate external attitude reference, and</p><p align="left">(b) The primary attitude indication is operative on the pilot’s-in-command side, and</p><p align="left">(c) Standby attitude indication is operative.</p></td></tr><tr><td valign="top" width="80"><p>34-20-2D</p></td><td valign="top" width="140"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>2</p></td><td colspan="2" valign="top" width="274"><p>Any in excess of two may be inoperative provided: </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) An independent primary attitude indication is operative at each required pilot’s station</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p>Note: A secondary/standby indication cannot satisfy the above condition (b).</p></td></tr><tr><td valign="top" width="80"><p>34-20-2E</p></td><td valign="top" width="140"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="37"><p>B</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="37"><p>1</p></td><td colspan="2" valign="top" width="274"><p>(O) Any in excess of one may be inoperative provided: </p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p align="left">(a) Operations are conducted under VFR, and</p><p align="left">(b) The primary attitude indication is displayed on both pilot’s stations, and</p><p align="left">(c) Standby attitude indication is operative.</p></td></tr><tr><td valign="top" width="80"></td><td valign="top" width="140"></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"><p><b>Procedures:</b></p><p>(O) To provide switching procedure to the crew to ensure adequate configuration of the displays in accordance with the above condition (b)</p></td></tr><tr><td colspan="2" valign="top" width="220"><p> (continued)</p></td><td valign="top" width="37"></td><td valign="top" width="35"></td><td valign="top" width="37"></td><td colspan="2" valign="top" width="274"></td></tr><tr height="0"></tr></table> <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td colspan="6" valign="top" width="491"><p>ATA Chapter: 34 Navigation</p></td><td valign="top" width="111"></td></tr><tr><td colspan="6" valign="top" width="491"></td><td valign="top" width="111"></td></tr><tr><td colspan="2" valign="top" width="221"><p>(1) System &amp; Sequence Numbers</p></td><td colspan="5" valign="top" width="382"><p>(2) Rectification Interval</p></td></tr><tr><td colspan="2" valign="top" width="221"><p>ITEM</p></td><td valign="top" width="38"></td><td colspan="4" valign="top" width="343"><p>(3) Number installed</p></td></tr><tr><td colspan="2" valign="top" width="221"></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td colspan="3" valign="top" width="308"><p>(4) Number required for dispatch</p></td></tr><tr><td colspan="2" valign="top" width="221"><p> (continued)</p></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"><p>(5) Remarks or Exceptions</p></td></tr><tr><td colspan="2" valign="top" width="221"></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"></td></tr><tr><td valign="top" width="76"><p>34-20-2F</p></td><td valign="top" width="146"><p>(Aeroplanes)</p><p>(Single pilot)</p></td><td valign="top" width="38"><p>A</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative for single pilot operations only for a maximum of 2 calendar days provided: </p></td></tr><tr><td valign="top" width="76"></td><td valign="top" width="146"></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"><p align="left">(a) Operations are conducted under day VMC in sight of the surface with adequate external attitude reference, and</p><p align="left">(b) A standby attitude indication is installed and operative.</p></td></tr><tr><td valign="top" width="76"><p>34-20-2G</p></td><td valign="top" width="146"><p>(Helicopters with MCTOM &lt; 3 175 kg)</p></td><td valign="top" width="38"><p>C</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative provided:</p><p align="left">(a) Operations are conducted under day VFR, and</p><p align="left">(b) Operations are not conducted over water out of sight of the land, and</p><p align="left">(c) Visibility is more than 1 500 m.</p></td></tr><tr><td valign="top" width="76"><p>34-20-3</p></td><td valign="top" width="146"><p>Standby Attitude Indication</p></td><td valign="top" width="38"></td><td valign="top" width="35"></td><td valign="top" width="38"></td><td colspan="2" valign="top" width="270"></td></tr><tr><td valign="top" width="76"><p>34-20-3A</p></td><td valign="top" width="146"><p>(Other than commercial air transport operations)</p></td><td valign="top" width="38"><p>D</p></td><td valign="top" width="35"><p>-</p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative provided flight is conducted under VMC with a visual horizon.</p></td></tr><tr><td valign="top" width="76"><p>34-20-3B</p></td><td valign="top" width="146"><p>(Aeroplanes &amp; Helicopters)</p></td><td valign="top" width="38"><p>B</p></td><td valign="top" width="35"><p>- </p></td><td valign="top" width="38"><p>0</p></td><td colspan="2" valign="top" width="270"><p>May be inoperative provided flight is conducted under day VMC with a visual horizon.</p></td></tr><tr height="0"></tr></table> Additional considerations: 34-20-2F: Prior to allowing dispatch without any attitude indication, a review of the certification requirements as well as the handling qualities and training of the flight crew is required. 34-20-3A & B Standby attitude indication: If the standby attitude indicator is needed to meet the applicable requirements (e.g. CS-23.2500 Electronic Flight Display or CS-25.1309) relief may not be granted for operations under IFR or at night. Case-by-case evaluations are, however, possible, based on the applicable CS-MMEL requirements. The VMC with a visual horizon limitation prohibits ‘VFR on top’ or ‘VFR over-the-top’ operations. Issue No: MMEL/2