Commonwealth legislation

AD/PA-31/57 - Elevator Balance Weights - Inspection

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Commonwealth

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legislative instrument

Plain English Summary

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This directive requires a short safety inspection of elevator balance weights inside the elevator nose channel on certain Piper PA‑31/PA‑31‑300 aeroplanes: verify rivnut pull‑up security and measure elevator unbalance (limit 96.4 inch‑lbs tail‑heavy). Compliance (or following FAA AD 77‑12‑02 instead) was required within 25 hours TIS after 19 Aug 1977.

It affects aircraft owners/operators or their maintenance organisations, who must arrange, pay for, and remedy any insecure fittings or excessive unbalance to protect elevator behaviour.

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AD/PA-31/57 - Elevator Balance Weights - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Piper PA-31 Series Aeroplanes

AD/PA-31/57 Elevator Balance Weights - Inspection 9/77

Applicability: All model PA-31 and PA-31-300 with wing luggage lockers per nayak STC. SA 986 SW.

Requirement: 1. Inspect the elevator balance weights fitted in the nose channel of the elevator for security of attachment (“Rivnut” pull-up) and check elevator unbalance (96.4 inch lbs. tail heavy maximum); or

FAA AD 77-12-02 amdt. 39-2915.

Compliance: Within 25 hours time in service after 19 August 1977.

Source text

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