ED Decision 2018/015/R
This AMC provides further guidance and acceptable means of compliance to supplement FAA AC 29-2C Change 7 AC 29.1303. § 29.1303 which is the EASA acceptable means of compliance, as provided for in AMC 29 General. However, some aspects of the FAA AC are deemed by EASA to be at variance with EASA’s interpretation or its regulatory system. EASA’s interpretation of these aspects is described below. Paragraphs of FAA AC 29.1303. § 29.1303 that are not amended below are considered to be EASA acceptable means of compliance.
a. Explanation
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(2) For rotorcraft, loss of or misleading primary flight information (attitude, altitude, and airspeed) is considered to be a catastrophic failure condition in instrument meteorological conditions. For an attitude instrument to be usable, it should be capable of providing the pilot with reliable references to pitch and roll attitudes throughout the possible rotorcraft angular position and rotational operating ranges so that a pilot can correctly recognise the extent of the unusual or extreme attitude and initiate an appropriate recovery manoeuvre. As indicated previously in paragraph a., an ETSO approval does not ensure compliance with the CS-29 installation requirements, including those requirements in CS 29.1303(g)(1).
(i) The minimum usability requirements for the aircraft attitude systems are defined in CS 29.1303(g)(1). The phrase in CS 29.1303(g)(1) ‘…is usable through +/-80 degrees of pitch and +/-120 degrees of roll’ means that the pilot should be able to quickly and accurately determine the aircraft’s pitch attitudes up to 80 degrees nose up and 80 degrees nose down. The ADI should also allow the pilot to quickly and accurately determine the aircraft’s roll attitude to 120 degrees of left and right roll.
(ii) The minimum usability requirement for the aircraft attitude system defined in CS 29.1303(g)(1) applies to all attitude systems installed in the aircraft. Attitude systems that do not meet the minimum usability requirements can provide misleading information to the pilot.
[Amdt No: 29/6]
EASA AMC 29.1303 clarifies rotorcraft attitude instrument usability, defining catastrophic failure in IMC and requiring pitch/roll references per CS 29.1303(g)(1).
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