AD/HU 269/76 Main Rotor Damper Pitch Bearing Case Inspection and Modification 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 269/76.

Schweizer (Hughes) 269 Series Helicopters

AD/HU 269/76 Main Rotor Damper Pitch Bearing
Case - Inspection and Modification 5/2009

Requirement:

CANCELLED.

This AD is cancelled on 7 May 2009.

Background:

This unique Australian AD raised in 1984 against Hughes Service Information Notice (SIN) No. N-189 required an inspection for cracking around the main rotor damper attach hole in the pitch bearing until modified by fitment of a spacer, which may be locally fabricated, designed for installation under the damper attach bolt, nut and washer to spread the clamping load over a wider area.

Compliance was: As per requirement document effective after 31 January 1984.

Requirement document:

Part I: Inspect within 100 hours of helicopter operation, or at next removal of rotor dampers, whichever is sooner, and each time damper attach bolt is re-torqued, until Part II of this notice is accomplished.

Part II: Modify at next removal of main rotor dampers.

This AD has been sufficiently promulgated for the affected aircraft 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

27 March 2009