AD/S-76/46 Electrical DC Power System Cancelled (Cth)

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-76/46.

Sikorsky S-76 Series Helicopters

AD/S-76/46 Electrical DC Power System 7/2009

Requirement:

CANCELLED.

This AD is cancelled on 2 July 2009.

Background:

This unique Australian AD raised in 1987 against Sikorsky Alert Service Bulletin (ASB) 76-24-8 required a one-time inspection or modification of both No.1 and No.2 generator ground and power path connections for security and corrosion and possible relocation of the DC GCU ground connections to improve reliability.

Compliance was:  For aircraft operated in IFR category:  Before next IFR flight.  For aircraft operated in VFR category:  Prior to or concurrent with next 25 flight hour inspection.

This AD has been sufficiently promulgated for the affected Helicopters to have been inspected and 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