AD/S-76/38 Main Rotor Gear Box No. 1 and No. 2 Input Bevel Pinion Housing Assemblies Inspection Cancelled (Cth)

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AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/S-76/38.

Sikorsky S-76 Series Helicopters

AD/S-76/38 Main Rotor Gear Box No. 1 and No. 2 Input Bevel Pinion Housing Assemblies - Inspection 7/2009

Requirement:

CANCELLED.

This AD is cancelled on 2 July 2009.

Background:

This unique Australian AD raised in 1985 against Sikorsky Service Bulletin (SB)
76-66-19 required an inspection of the main rotor gearbox No.1 and No.2 input bevel pinion housing assembly following manufacturer report of torque loss on the input bevel pinion housing assembly retaining nuts.

Compliance was:

1.    Prior to issue of an Certificate of Airworthiness; or

2.    Prior to the installation of a Main Rotor Gearboxes (MRGB) called up in the requirement document.

This AD has been sufficiently promulgated for the affected MRGB to have been modified by now; therefore this AD is considered to be no longer required.

James Coyne
Delegate of the Civil Aviation Safety Authority

18 May 2009

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