Commonwealth legislation

AD/S-76/9 - Cyclic Torque Tube - Inspection of Centre Support Bearing Housing

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This AD mandates owners/operators of Sikorsky S‑76 helicopters to inspect the cyclic torque tube’s centre support bearing housing (follow Sikorsky CSB 76‑67‑7) within 10 hours TIS after 14 Feb 1980. It was issued because some housings were made with the bearing‑retaining shoulder on the wrong side, risking axial bearing displacement. Operators bear inspection and any repair costs and must schedule urgent maintenance.

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AD/S-76/9 - Cyclic Torque Tube - Inspection of Centre Support Bearing Housing

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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-76/9 Cyclic Torque Tube - Inspection of Centre Support Bearing Housing

3/80

Applicability: Model S-76. Document: Sikorsky CSB 76-67-7.

Compliance: Within 10 hours time in service after 14 February 1980.

Background: Some bearing support housings have been incorrectly manufactured, with the bearing retaining shoulder on the wrong side. This would permit axial displacement of the bearing along the torque tube.

Source text

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