Commonwealth legislation

AD/S-76/36 - Fuselage - Engine Compartment Centre Firewall - Inspection of No. 1 Tail Drive Shaft for Adequate Clearance

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legislative instrument

Plain English Summary

2/10 complexity

This Airworthiness Directive mandates immediate inspection of the No.1 tail-rotor drive shaft clearance relative to the engine compartment centre firewall and specified doubler on Sikorsky S‑76A helicopters—before any further flight after 12 February 1985—following a report that contact severed the shaft. The AD references Sikorsky Alert SB 76‑53‑24 and CBT‑TP‑84‑098 for the inspection and corrective actions.

Operators bear inspection and repair costs, may need to ground aircraft until compliance, and must follow the regulator’s mandated timeline.

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AD/S-76/36 - Fuselage - Engine Compartment Centre Firewall - Inspection of No. 1 Tail Drive Shaft for Adequate Clearance

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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-76/36 Fuselage - Engine Compartment Centre

Firewall - Inspection of No. 1 Tail Drive Shaft for Adequate Clearance

Applicability: All model S-76A Helicopters.

Requirement: Sikorsky Alert S.B. 76-53-24. Sikorsky CBT-TP-84-098.

Compliance: Unless already accomplished, before further flight after 12 February 1985.

Background: A report indicates No. 1 section tail rotor drive shaft became severed due to interference with doubler P/N 76070-20057-101.

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Source text

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