AD/PDH/7 Barrel Support Blocks 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/PDH/7.

Propellers - Variable Pitch - De Havilland

AD/PDH/7 Barrel Support Blocks - Modification 4/2009

Requirement:

CANCELLED.

This AD is cancelled on 9 April 2009.

Background:

This unique Australian AD was raised in 1968 against Hawker Siddeley MNS
Series 2 BCS No. 87 (Mod. No. 29104) requiring a modification to the Barrel Support Blocks of model PD136/212/1, PD170/212/1 and PD175/212/1 propellers fitted to
De Havilland DH-114 (Herron) aircraft.

Compliance was before installation in an aircraft following next overhaul completed after 21 March 1968.

Given the extended period this AD has been promulgated, and that the modification would have been done by now, this AD is considered to be no longer required.

James Coyne
Delegate of the Civil Aviation Safety Authority

16 February 2009