1AD/GENERAL/22 - Engine Oil Tank - Modification

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/22 Engine Oil Tank - Modification NK

Applicability: All aeroplanes fitted with hydraulically operated feathering propellers which draw their feathering oil supply from the engine oil tank.

Requirement: 1. Modify engine oil tanks by reworking the engine oil supply standpipe in such a manner that, in the event of exhaustion of the engine oil supply, sufficient oil will be retained in the tank to enable the propeller to be feathered. This reserve supply shall be available only to the feathering pump; or

Note: In some installations incorporating a hopper in the oil tank, there is a possibility of an increase in the height of the standpipe causing a restriction of the flow of oil from tank to hopper leading to oil starvation under cold starting conditions and overheating of oil under high power. In such cases, it will be necessary also to modify the neck of the hopper to ensure that restriction of oil flow cannot take place.

2. ANO 105.1.0.1.49; or

3. AD/DC3/22.