AD/LYC/89 Amdt 4 - Crankshaft Gear (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 repeals Airworthiness Directive (AD) AD/LYC/89 Amdt 3 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Lycoming Piston Engines AD/LYC/89 Crankshaft Gear 20/2014 Amdt 4

Applicability: This Airworthiness Directive (AD) applies to all Textron Lycoming direct drive piston engines; excepting the O-145, O-320H, O-360E, LO-360E, LTO-360E, TO-360E, O-435 and TIO-541 series engines. Requirements: 1. Inspect, and if necessary repair, the crankshaft counter bored recess, the alignment dowel, the bolt hole threads, and the crankshaft gear for wear, galling, corrosion, and fretting in accordance with Lycoming Mandatory Service Bulletin No. 475C dated 30 January 2003 (MSB No. 475C) or later revision approved by the United States of America Federal Aviation Administration (FAA).

2. Remove the existing gear retaining bolt and lockplate from service, and install a new bolt and lockplate, in accordance with Lycoming MSB No. 475Cor later revision approved by FAA.

3. Do not install into any engine the gear retaining bolt and lockplate removed in compliance with this AD.