Commonwealth legislation

AD/S-76/58 - Tail Gearbox Output Shaft

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive mandates a one-time safety inspection of the tail rotor gearbox output shaft on specific Sikorsky S-76 helicopters.

Who must comply? Owners and operators of S-76A, S-76B, and S-76C helicopters with serial numbers up to 760390.

What must be done? Inspect the internal bore of the tail gearbox output shaft for scratches, grooves, or surface irregularities that could cause metal fatigue. Operators must follow the procedures in Sikorsky Alert Service Bulletin No 76-66-27.

Why is this required? Scratches or scoring inside the shaft create stress points that can lead to premature fatigue failure. If the tail rotor gearbox fails, the helicopter could become uncontrollable.

When must it be done? The inspection must be completed by the earlier of:

150 flight hours after 30 April 1992, or
30 August 1992

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AD/S-76/58 - Tail Gearbox Output Shaft

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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 Sikorsky S-76 Series Helicopters

AD/S-76/58 Tail Gearbox Output Shaft 5/92

Applicability: All model S76A, S76B and S76C helicopters up to and including S/N 760390. Requirement: Action in accordance with Sikorsky Alert Service Bulletin No 76-66-27.

Compliance: Within 150 hours time in service from 30 April 1992 or by 30 August 1992, whichever occurs first.

Background: The manufacturer requires a one-time inspection of the tail rotor gearbox output shaft assembly internal bore for a surface irregularity/groove. Scoring in the bore area may initiate a premature fatigue failure.

Source text

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