AD/T53/5 Accessory Drive Gearbox Rework 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/T53/5.

AlliedSignal (Lycoming) Turbine Engines - T53 Series

AD/T53/5 Accessory Drive Gearbox - Rework 8/2009

Requirement:

CANCELLED.

This AD is cancelled on 30 July 2009.

Background:

This unique Australian AD was originally raised in1972 and again in 1986 (with no changes) against Lycoming Service Bulletin (SB) No.41, Lycoming Overhaul Modification Bulletin (OMB) No. 0028, Lycoming Field Service Bulletin (FSB)
No. 0010 and AD/LYC-T/5A requiring rework to the accessory drive gearbox to improve lubrication to the main oil pump drive spline.

Compliance was prior to installation in an aircraft following next reconditioning completed after 30 June 1972.

This AD has been sufficiently promulgated for the affected engines 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

17 June 2009