ED Decision 2020/012/R
Summary of the guidance items:
Item |
ATA |
Inertial Separators - Position Indicating System |
30-00-1 |
Airframe Aerodynamic Surface Ice Protection Monitoring System |
30-10-1 |
Engine Inlet De-icing/Anti-icing Systems Monitoring System |
30-21-1 |
Pitot Heating Failure Indication System |
30-31-2 |
Alternative Windshield Rain Protection Means (e.g. Rain Repellent System, Coating, etc.) (MC) |
30-40-1 |
Windshield Heating/De-icing Indicating System |
30-41-1 |
Windshield Wipers (MC) |
30-42-1 |
Propeller De-ice/Anti-ice System Monitoring System |
30-61-1 |
Visual Ice Evidence Indication |
30-80-1 |
Ice Detection System |
30-80-2 |
Aircraft applicability: Aeroplanes
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-00-1 |
Inertial Separators — Position Indicating System |
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30-00-1A |
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B |
- |
0 |
May be inoperative provided: (a) operations are not conducted at any time in known or forecasted icing conditions, and (b) Operations are conducted in day VMC. |
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Note 1: Inertial separators includes pneumatic de-icing systems. Note 2: In the absence of any Aircraft Flight Manual definition, icing conditions should be taken as visible moisture or precipitation, when OAT on the ground and for takeoff, or TAT in flight is 10 °C or below |
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Additional considerations:
Depending upon the aircraft design, failure of the position indicating system may be compensated by crew monitoring from the flight crew compartment and appropriate wing inspection lights (or alternate means) are operative for night operations.
Condition b) on day VMC may be alleviated based on demonstration of the capability of facing inadvertent encounter of icing conditions during aircraft certification. Aircraft expected types of operation have to be taken into account with regards to the risk exposure to unexpected icing conditions (e.g. FL limitation).
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-10-1 |
Airframe Aerodynamic Surface Ice Protection Monitoring System
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30-10-1A |
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B |
- |
0 |
One or more may be inoperative provided operations are not conducted at any time in known or forecasted icing conditions.
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Additional considerations:
The above guidance covers items such as wing, vertical/horizontal stabilisers and ice protection monitoring system on airplanes. Additional relief can be granted based on the condition that the airframe aerodynamic surface ice protection system is considered inoperative, provided that such a relief is available in the MMEL. Associated dispatch conditions and rectification intervals may then become applicable.
In the absence of any Aircraft Flight Manual definition, icing conditions should be taken as visible moisture or precipitation, when the OAT is less than +5°C.
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-21-1 |
Engine Inlet De-icing/Anti-icing System Monitoring System |
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30-21-1A |
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B |
- |
- |
May be inoperative provided operations are not conducted at any time in known or forecasted icing conditions.
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Additional considerations:
Additional relief can be granted based on the condition that the engine inlet de-icing/anti-icing system is considered inoperative, provided that such a relief is available in the MMEL. Associated dispatch conditions and rectification intervals may then become applicable.
In the absence of any Aircraft Flight Manual definition, engine icing conditions should be taken as visible moisture or precipitation, when the OAT is less than +10°C.
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-31-2 |
Pitot Heating Failure Indication System |
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30-31-2A |
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- |
- |
- |
May be inoperative provided the associated pitot heating system is considered inoperative.
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Additional considerations:
Additional relief may be granted based on the certification basis and the applicable operational requirements.
Particular attention shall be paid to design where the failure indication system is covering multiple heaters (e.g. pitot, static, angle-of-attack, TAT/SAT). Cumulative effects should in these cases be evaluated.
Aircraft applicability: Aeroplanes
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-40-1 |
Alternative Windshield Rain Protection Means (e.g. Rain Repellent System, Coating, etc.) (MC) |
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30-40-1A |
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C |
- |
0 |
May be inoperative provided: |
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(a) No precipitation is forecasted during a period from one hour before until one hour after the estimated time of departure and arrival at the take-off and destination aerodromes, and |
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(b) Affected system is not part of the equipment required for the intended operation. |
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Note: Take-off and destination aerodromes include any take-off and destination alternate aerodromes required by the operational rules. |
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30-40-1B |
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D |
- |
0 |
May be inoperative provided windshield wipers are operative. |
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Additional considerations:
30-40-1A Condition (b) ensures that when low visibility conditions are known or forecasted, approach or take-off minima do not require their use.
This can be verified, for example, by checking the Aircraft Flight Manual for minimum required equipment for Cat II or III approaches and low visibility take-offs.
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-41-1 |
Windshield Heating/De-icing Indicating System |
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30-41-1A |
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C |
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1 |
(O) May be inoperative provided: |
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(a) The indicating system associated with the pilot handling/flying station is operative, and |
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(b) An alternate procedure is established and used to ensure correct operation of the affected windshield heating system. |
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Procedures |
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(O) To give guidance to perform a pre-flight check of the affected heating system. |
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30-41-1B |
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C |
- |
0 |
May be inoperative provided operations are not conducted into known or forecasted icing conditions. |
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Additional considerations:
The next failure of the heating system may be undetected. Consequently the dispatch is allowed provided that at least the indicating system on the flying pilot’s side is operative. This will ensure safe operation into icing conditions.
30-41-1B This option is available only if the windshield heating system does not contribute to structural integrity.
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-42-1 |
Windshield Wipers (MC)
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30-42-1A |
(Aeroplanes) |
C |
- |
0 |
May be inoperative provided: |
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(a) No precipitation is forecasted at the take-off and destination aerodromes, and |
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(b) Affected wiper is not part of the equipment required for the intended operation. |
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Note: Take-off and destination aerodromes include any take-off and destination alternate aerodromes required by the operational rules. |
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30-42-1B |
(Helicopters) |
C |
- |
- |
One or more may be inoperative provided the helicopter is not operated in known or forecast precipitation that requires their use. |
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30-42-1C |
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D |
- |
0 |
(O) (M) May be inoperative provided an alternative windshield rain protection mean (e.g. Rain Repellent System, Coating, etc.) is installed and verified operative. |
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Procedures (O) or (M) To provide guidance to check correct operation of the system. |
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30-42-1-1 |
High Speed Function |
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30-42-1-1A |
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C |
- |
0 |
May be inoperative provided the associated low speed function is operative. |
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30-42-1-2 |
Low Speed Function |
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30-42-1-2A |
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C |
- |
0 |
May be inoperative provided the associated high speed function is operative. |
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30-42-1-3 |
Other Control Function (e.g. Park, Intermittent, etc.) |
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30-42-1-3A |
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C |
- |
0 |
One or more may be inoperative provided: |
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(a) It does not affect operation of the wipers, and (b) It is acceptable to the affected flight crew member(s). |
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Additional considerations:
30-42-1A Condition (b) ensures that when low visibility conditions are known or forecasted, approach or take-off minima do not require their use.
This can be verified, for example, by checking the Aircraft Flight Manual for minimum required equipment for Cat II or III approaches and low visibility take-offs.
30-42-1B accounts for the specific helicopters mission profile (hover capability).
30-42-1C allows dispatch with windshield wipers inoperative when an equivalent system is installed (rain repellent, etc.) provided it has been demonstrated as efficient as the wipers in the certified kind of operations (low speed, light rain, etc.)
30-42-1-1:
It is assumed in this guidance that the efficiency of wipers under low speed is adequate for all kind of precipitations.
Aircraft applicability: Aeroplanes
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-61-1 |
Propeller De-ice/Anti-ice System Monitoring System |
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30-61-1A |
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B |
- |
0 |
One or more may be inoperative provided operations are not conducted at any time in known or forecasted icing conditions.
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Additional considerations:
Additional relief can be granted based on the condition that the propeller de-ice/anti-ice system is considered inoperative, provided that such a relief is available in the MMEL. Associated dispatch conditions and rectification interval may then become applicable.
In the absence of any Aircraft Flight Manual definition, engine icing conditions should be taken as visible moisture or precipitation when the OAT is less than +10°C.
Aircraft applicability: Aeroplanes
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-80-1 |
Visual Ice Evidence Indication |
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30-80-1A |
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B |
- |
0 |
May be inoperative provided operations are not conducted in known or forecasted icing conditions.
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30-80-1B |
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D |
- |
0 |
May be inoperative provided procedures are not dependent upon its use. |
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30-80-1-1 |
Visual Ice Evidence Indication Lighting system |
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30-80-1-1A |
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D |
- |
0 |
May be inoperative for daylight operations provided procedures are not dependent upon its use. |
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30-80-1-1B |
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B |
- |
0 |
(O) May be inoperative for night operations provided an alternate means is used to illuminate the affected indicator. |
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Procedures (O) An alternate means can be that a portable lamp/light of adequate capacity for wing and/or control surface inspection is available for night operations in icing conditions. |
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Additional considerations:
30-80-1A: In the absence of any Aircraft Flight Manual definition, icing conditions should be taken as visible moisture or precipitation when the OAT is less than +5°C.
30-80-1B entry applies to systems which are not used as a mean to monitor the ice accretion.
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 30 Ice and Rain Protection |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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30-80-2 |
Ice Detection System
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30-80-2A |
System certified as an Advisory System |
D |
- |
0 |
May be inoperative provided that procedures do not require its use. |
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30-80-2B |
System certified as a Primary Detection System |
C |
- |
0 |
(O) May be inoperative provided that alternate procedures are established and used. |
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Procedures: (O) To provide a procedure to the crew to determine the conditions in which the ice protection system must be activated manually. |
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Additional considerations:
Advisory detection system on which procedures are based may obtain relief in accordance with the guidance for primary detection system.
Definitions of primary and advisory detection system are provided as follows:
Beside the pilot’s appraisal of actual ice built-up (on wiper blades, window frames or propeller spinner), some aeroplanes use in-flight ice detection systems (IIDS). IIDS may either directly detect the presence of ice on the aeroplane surface or detect that the aeroplane is in icing conditions. There are basically two classes of IIDS:
1. The advisory IIDS which trigger a signal in the flight crew compartment. The flight crew is responsible for monitoring the icing conditions or the ice accretion as defined in the Aircraft Flight Manual and activation by the pilot of the ice protection systems remains a requirement.
2. The primary IIDS which is the prime means used to determine when the ice protection systems should be activated. The ice protection systems may be automatically or manually activated.
Considerations for aircraft certified for ‘limited’ icing conditions have to be taken into account and may result in a different level of relief.
For helicopters, with an optional ice protection/detection system installed for operations into ice conditions, a D rectification interval may be accepted provided that operations are not conducted into known or forecast icing conditions.
EASA guidance for ATA 30 ice protection systems specifies dispatch conditions and rectification intervals, allowing inoperative monitoring systems only when operations avoid known or forecasted icing conditions.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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