AD/ATF3/3 H.P. Turbine Rotor Assembly P/No. 3001766-7 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/ATF3/3.

AlliedSignal (Garrett/AiResearch) Turbine Engines - ATF3 Series

AD/ATF3/3 H.P. Turbine Rotor Assembly P/No. 3001766-7 8/2009

Requirement:

CANCELLED.

This AD is cancelled on 30 July 2009.

Background:

This unique Australian AD raised in 1986 against Garrett Turbine Engine Company Service Bulletin (SB) SB No. ATF3-72-6070 required an inspection and modification by replacement of selected H.P. turbine rotor assemblies due susceptibility to cracking in the curvic area of the disc.

Compliance was:  At next removal of H.P. turbine rotor assembly but not later than the next periodic inspection that provides access to the H.P. turbine rotor assembly after 31 August 1986.

This AD has been sufficiently promulgated for the affected engines 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

16 June 2009