AD/CON/58 - Challenger Engineering Chrome Plated Cylinder Barrels

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, form the primary regulatory framework for civil aviation in Australia, overseen by the Civil Aviation Safety Authority (CASA). One particular legislative instrument, F2006B08638, addresses a specific issue with Teledyne Continental Motors Piston Engines that have cylinder assemblies chrome-plated by Challenger Aero Engineering Pty Ltd after January 1, 1989. The problem identified was the potential compromise of airworthiness due to unapproved rework procedures that affected the integrity of the cylinder head to barrel joint. This safety directive aims to mitigate any risks by requiring the removal and quarantine of these affected cylinder assemblies to ensure that any engines using them are not compromised. The overarching policy objective is to maintain the highest standards of air safety by addressing potential hazards proactively.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39, covers a variety of directives related to airworthiness, including AD/CON/58 concerning Challenger Engineering chrome-plated cylinder barrels for Teledyne Continental Motors piston engines. This directive applies to all Continental opposed piston engines fitted with cylinder assemblies having barrels chrome-plated for and supplied by Challenger Aero Engineering Pty Ltd after 1 January 1989. The directive mandates the removal of these affected cylinder assemblies from both installed and uninstalled engines, with compliance deadlines requiring removal and quarantine before specified dates. Installed engines must have the affected components removed within 100 engine operating hours after 12 July 1990, or by 31 August 1990, whichever comes first. Uninstalled engines must be addressed prior to installation following 12 July 1990. Quarantined assemblies are to be classified as major defects and reported according to Civil Aviation Order 108, with further inhibition and disposition to be determined by the Civil Aviation Safety Authority. This directive does not specify exclusions or exemptions but underscores the critical nature of ensuring the airworthiness of these engines by removing potentially compromised components.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 106, mandates the removal and quarantine of certain cylinder assemblies from Continental opposed piston engines. This requirement is detailed in the Civil Aviation Safety Authority Schedule of Airworthiness Directives AD/CON/58, which applies to all such engines that have cylinder assemblies with barrels chrome plated for and supplied by Challenger Aero Engineering Pty Ltd (formerly Challenger Engineering Pty Ltd) after 1 January 1989 (Section 1). The directive demands that these affected cylinder assemblies be removed from both installed and uninstalled engines (Section 2). Once removed, these assemblies must be quarantined in accordance with specific notes provided within the directive (Section 3). The obligations imposed by the directive require engine operators to ensure that affected cylinder assemblies are removed within specific 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 4). Uninstalled engines must have the affected assemblies removed prior to installation after 12 July 1990 (Section 5). Additionally, quarantined assemblies must be classified as Major Defects and reported according to CAO 108 Defect Reporting procedures (Section 6). Quarantined assemblies must also be inhibited in accordance with Lycoming requirements and their disposition will be determined by the Authority (Section 7). Failure to comply with this directive can result in significant civil and criminal consequences. The airworthiness of the engine may be compromised if the directive is not followed, leading to potential safety hazards. While specific penalties are not detailed in the directive, non-compliance with Civil Aviation Regulations can result in substantial fines and legal action under relevant Australian aviation laws. The precise penalties would be determined by the Civil Aviation Safety Authority based on the severity and impact of the non-compliance.