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.
Overview
The Airworthiness Directive AD/LYC/89 Amdt 3 was issued by the Civil Aviation Safety Authority (CASA) in 2004 to address specific safety concerns related to Textron Lycoming direct drive piston engines. This amendment, which became effective on 30 September 2004, aims to rectify issues identified in previous models and service bulletins, such as wear, galling, corrosion, and fretting of the crankshaft counter bored recess, alignment dowel, bolt hole threads, and crankshaft gear. The directive was enacted to ensure the airworthiness of the affected aircraft by mandating inspections and necessary repairs or replacements in accordance with Lycoming Mandatory Service Bulletin No. 475C or its approved revisions. This action was taken to mitigate potential unsafe conditions that could arise from the specified engine components.
Scope and Application
The Airworthiness Directive AD/LYC/89 Amdt 3 pertains specifically to Textron Lycoming direct drive piston engines, excluding certain models such as the O-145, O-320H, O-360E, LO-360E, LTO-360E, TO-360E, O-435, and TIO-541 series engines. This directive is issued under the authority of the Civil Aviation Safety Authority (CASA) and applies to all applicable piston engines within the Australian jurisdiction, requiring compliance with the specified actions to address safety concerns identified in the crankshaft gear system. The directive mandates that inspections, repairs, and replacements of the crankshaft counter bored recess, alignment dowel, bolt hole threads, and crankshaft gear must be conducted in accordance with Lycoming Mandatory Service Bulletin (MSB) No. 475C or any later revisions approved by the Federal Aviation Administration (FAA). Furthermore, it stipulates the removal and replacement of the existing gear retaining bolt and lockplate with new components, ensuring that the removed parts are not reused in any engine. The compliance requirements are to be met at each removal of the engine following a propeller strike event, as detailed in Airworthiness Directive AD/ENG/6. This directive became effective on 30 September 2004, superseding earlier amendments and reflecting changes introduced by FAA AD 2004-10-14 amendment 13644.
Key Provisions
The Airworthiness Directive (AD) AD/LYC/89 Amdt 3 applies to all Textron Lycoming direct drive piston engines, except for the O-145, O-320H, O-360E, LO-360E, LTO-360E, TO-360E, O-435, and TIO-541 series engines (Applicability section). The directive mandates specific actions to be taken to address an unsafe condition, including inspecting and repairing the crankshaft counter bored recess, the alignment dowel, the bolt hole threads, and the crankshaft gear for wear, galling, corrosion, and fretting (Requirement section 1). Furthermore, the existing gear retaining bolt and lockplate must be removed and replaced with a new bolt and lockplate (Requirement section 2). Importantly, the removed bolt and lockplate must not be reinstalled in any engine (Requirement section 3). These actions must be carried out in accordance with Lycoming Mandatory Service Bulletin (MSB) No. 475C, dated January 30, 2003, or any later revision approved by the Federal Aviation Administration (FAA) (Requirement section).
The obligations imposed by this Airworthiness Directive are clear and specific. Engine operators and maintenance personnel must ensure that the outlined inspections and repairs are carried out whenever the engine is removed in response to another Airworthiness Directive, AD/ENG/6, following a propeller strike event (Compliance section). The requirements of this AD supplement the requirements of AD/ENG/6, and must be adhered to in addition to them (Compliance section, Note 2). The directive is effective from 30 September 2004, as stated in the Compliance section.
Failure to comply with the provisions of this Airworthiness Directive can result in serious consequences. The AD is a regulatory requirement issued under the Civil Aviation Safety Regulations 1998, and non-compliance can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). The potential penalties for non-compliance with such directives can be severe, including substantial fines and potential criminal charges, depending on the severity of the breach and its impact on aviation safety. The specific maximum penalties are not detailed in the text provided, but they are typically outlined in the relevant legislation and can vary based on the nature and extent of the breach.