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) AD/LYC/89 Amdt 2 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the 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
Amdt 3
Crankshaft Gear 10/2004
Applicability: 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.
Requirement: 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 (MSB) No. 475C, dated January 30, 2003 or later revision approved by 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. 475C, dated January 30, 2003 or later revision approved by FAA.
3. Do not install the gear retaining bolt and lockplate removed in compliance with this AD, into any engine.
Note 1: FAA AD 2004-10-14 amendment 39-13644 refers.
Compliance: At each removal of the engine in response to Airworthiness Directive AD/ENG/6 following a propeller strike event.
Note 2: Requirements of this Airworthiness Directive are in addition to the requirements of Airworthiness Directive AD/Eng/6.
This Amendment becomes effective on 30 September 2004.
Background: This amendment reflects the changes introduced by FAA AD 2004-10-14 amendment 13644 superseding FAA AD 91-14-22 amendment 39-6916.
This Directive was originally issued in December 1991 to require the inspection, rework or replacement of the crankshaft drive gear, and the replacement of the crankshaft drive gear retainer bolt, at each removal of the crankshaft gear.
Amendment 1 of this Directive, which became effective 6 Jan 1994, was issued to reflect revision B of Service Bulletin No. 475, which increased the number of engine models applicable.
Lycoming Piston Engines
AD/LYC/89 Amdt 3 (continued)
Amendment 2 of this Directive, which became effective 2 October 2003, was issued to reflect revision C of Service Bulletin No. 475, which revised details on crankshaft gears.
Amendment 1 of this Airworthiness Directive became effective on 2 October 2003.
Bernard Malcolm Hole
Delegate of the Civil Aviation Safety Authority 28 July 2004
The above AD is notified in the Commonwealth of Australia Gazette on 8 September 2004.