1AD/GENERAL/57 Amdt 1 - Pitot Heat Inoperative Indicators - Installation

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Aircraft - General

AD/GENERAL/57

Amdt 1

Pitot Heat Inoperative Indicators - Installation 10/92

Applicability: Transport Category turbine powered aircraft with a maximum take-off weight greater than 5700 Kg used in regular public transport operations.

Requirement: If a flight instrument pitot heating system is installed, an indication system must be provided to indicate to the flight crew when that pitot heating system is not operating. The indication system must comply with the following requirements:

(a) The indication provided must incorporate an amber light that is in clear view of a flight crew member.

(b) The indication provided must be designated to alert the flight crew if either of the following conditions exist:

(1) The pitot heating system is switched “OFF”.

(2) The pitot heating system is switched “ON” and any pitot tube heating element is inoperative.

Compliance: Prior to 17 September 1992.

Background: Pilots of transport aircraft have encountered difficulties because they were unaware that pitot heat was inoperative. This amendment is issued to clarify the applicability following the introduction of Commuter Category aircraft.