Commonwealth legislation

AD/GENERAL/22 - Engine Oil Tank - Modification

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This Airworthiness Directive requires owners/operators of aeroplanes with hydraulically operated feathering propellers (that draw oil from the main engine oil tank) to modify the tank’s oil supply standpipe so a reserve of oil is trapped and available only to the feathering pump. If a tank has an internal hopper, its neck may also need modification to avoid hopper starvation or overheating. The change preserves the ability to feather a failed engine when the main oil supply is lost.

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Current sections

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AD/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.

ANO 105.1.0.1.49; or
AD/DC3/22.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

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

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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.

ANO 105.1.0.1.49; or
AD/DC3/22.