AD/HU 369/4 Main Rotor Locknut and Retaining Ring 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 369/4.

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/4 Main Rotor Locknut and
Retaining Ring - Modification 6/2009

Requirement:

CANCELLED.

This AD is cancelled on 4 June 2009.

Background:

This unique Australian AD raised in 1970 against Hughes Service Information Notice (SIN) No. HN-11 required a modification by installation of new main rotor locknut and retaining ring following rework of main rotor mast tube.

Compliance was:  In accordance with the requirement document; which was:

1.    Shall be accomplished within next 100 hours or at next 300 hour inspection, whichever is the sooner, for helicopters which have had a main rotor hub removal since delivery.

2.    Shall be accomplished at next 300 hour inspection, for helicopters which have not had a main rotor hub removal since delivery.

This AD has been sufficiently promulgated for the affected aircraft 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

24 April 2009