AD/HU 269/91 Main Transmission Pinion Assembly 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/HU 269/91.

Schweizer (Hughes) 269 Series Helicopters

AD/HU 269/91 Main Transmission Pinion Assembly 5/2009

Requirement:

CANCELLED.

This AD is cancelled on 7 May 2009.

Background:

This unique Australian AD raised in 1988 against Schweizer Service Information Notice (SIN) No. N-216 (out-of-date) required an inspection for cracking of the pinion assembly of the main transmission.  Failure of the pinion could result in loss of drive to the main rotor.

Compliance was:

1.    For Helicopters: Within 300 hours TIS after 25 January 1988 or by 30 June 1988 whichever occurs first.

2.    For Spares: Before installation on an aircraft after 25 January 1988.

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

James Coyne
Delegate of the Civil Aviation Safety Authority

27 March 2009