AD/LYC/87 - Challenger Engineering Chrome Plated Cylinder Barrels

Overview

The Civil Aviation Regulations 1998, specifically Part 39, was enacted to ensure the safety of civil aviation in Australia. This piece of legislation, overseen by the Civil Aviation Safety Authority (CASA), addresses the problem of compromised airworthiness due to unapproved rework procedures performed by Challenger Aero Engineering Pty Ltd on Lycoming piston engine cylinders. The overarching policy objective is to maintain the highest safety standards in civil aviation by ensuring that aircraft components meet the necessary airworthiness requirements. The regulation targets all Lycoming opposed piston engines fitted with cylinder assemblies chrome-plated by Challenger Aero Engineering after January 1, 1989, mandating their removal from service and quarantine to prevent potential safety risks. The Civil Aviation Safety Authority issued this directive to mitigate the risks associated with unapproved rework on Challenger Engineering chrome-plated cylinder barrels. The rework procedures, which involved the removal and refitting of cylinder heads, compromised the integrity of the cylinder head to barrel joint, potentially endangering the airworthiness of affected engines. The directive requires that these cylinder assemblies be removed and quarantined, with compliance timelines set for both installed and uninstalled engines. The directive also mandates the classification of quarantined assemblies as Major Defects and requires adherence to specific reporting and inhibition procedures.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, pertains to the Civil Aviation Safety Authority’s Schedule of Airworthiness Directives. This legislation targets Lycoming piston engines with cylinder assemblies that have barrels chrome plated by Challenger Engineering (formerly Challenger Aero Engineering Pty Ltd) post 1 January 1989. The directive mandates the removal of these affected cylinder assemblies from both installed and uninstalled engines and their subsequent quarantine. The compliance timeline requires installed engines to have the assemblies removed within 100 engine operating hours after 12 July 1990 or before 31 August 1990, whichever is earlier, while uninstalled engines must have the assemblies removed prior to installation following 12 July 1990. The quarantined assemblies are to be classified as Major Defects and reported under CAO Section 100.8, with specific inhibition and disposition instructions as notified by the Authority. This directive does not specify exclusions or thresholds but covers all Lycoming opposed piston engines with the described modifications.

Key Provisions

The primary requirement under the Civil Aviation Regulations 1998 (Cth), Part 39, Section 106, specifically the Airworthiness Directive AD/LYC/87 issued on 7th September 1990, mandates that all Lycoming opposed piston engines equipped with cylinder assemblies that have barrels chrome plated by Challenger Aero Engineering Pty Ltd after 1 January 1989 must have these assemblies removed from service (Section 106(1)). The removed cylinder assemblies, whether currently installed or uninstalled, must be quarantined to prevent their use in any engine. This directive is a safety measure due to the unapproved rework of these cylinders, which included the refitting of the cylinder head, potentially compromising the integrity of the joint between the cylinder head and barrel. Under the obligations imposed by the Act, operators of the affected engines must ensure that the cylinder assemblies are removed and quarantined before specified timeframes. For engines already installed, the removal must occur within 100 engine operating hours after 12 July 1990, or before 31 August 1990, whichever comes first (Section 106(2)). For uninstalled engines, the removal must occur prior to their installation after 12 July 1990. Additionally, these quarantined assemblies are to be classified as Major Defects and reported in accordance with Civil Aviation Order (CAO) Section 100.8 Defect Reporting procedures (Section 106(3)). The quarantined assemblies must also be inhibited in accordance with Lycoming's requirements, and any disposition of these assemblies will be notified by the Authority (Section 106(4)). Failure to comply with the provisions of this Airworthiness Directive could lead to significant legal and safety repercussions. While the specific civil or criminal penalties are not detailed within the directive, non-compliance with airworthiness directives is generally viewed seriously by the Civil Aviation Safety Authority (CASA). Potential consequences could include fines, operational restrictions, or even grounding of the aircraft until compliance is achieved. In severe cases, non-compliance could lead to prosecution under the Civil Aviation Act 1988 (Cth), resulting in penalties that could include substantial fines and imprisonment. The safety of flight operations is paramount, and any breach of airworthiness directives can have serious implications for both the operator and the public.