AD/CON/61 - Crankshaft Removal/Inspection

Overview

The Civil Aviation Regulations 1998, amended through Legislative Instrument F2006B08639, introduced specific Airworthiness Directives to address safety concerns related to Teledyne Continental piston engines. Enacted by the Australian Government, this legislation aims to rectify issues identified with crankshaft repairs performed by Arnhem Aircraft Engineering Pty Ltd during a specific period. The directive was introduced to mitigate the risk of in-flight failures due to grinding cracks in crankshaft assemblies. The policy objective is to ensure that all affected engines undergo a thorough inspection and repair, if necessary, to maintain the highest standards of aviation safety. This is achieved by requiring the removal and inspection of crankshafts from engines that were overhauled or had their crankshafts disassembled for major work by Arnhem Aircraft Engineering Pty Ltd between 1 January 1990 and 6 August 1992.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, mandates the application of Airworthiness Directive AD/CON/61 concerning crankshafts of Teledyne Continental piston engines. This directive applies to all engines that were overhauled by or had their crankshafts disassembled for major work by Arnhem Aircraft Engineering Pty Ltd under Certificate of Approval No 4049 within the timeframe of 1 January 1990 to 6 August 1992. The directive is concerned with ensuring the safety of these engines through specific inspection and compliance requirements. For installed engines, compliance is required before 31 August 1992, while uninstalled engines must adhere to the directive before being installed into an aircraft. The directive necessitates the removal of the crankshaft assembly and a dimensional check of all bearing journals. Any crankshafts found to have bearing journal diameters below the standard dimensions specified in the Teledyne Continental Engine Overhaul Manual must be quarantined, and the local CAA Airworthiness District Office must be notified. Conversely, crankshafts meeting the specified dimensions may be refitted to an engine. This directive is a response to issues identified with crankshafts repaired by grinding bearing journals, some of which developed grinding cracks and failed during flight.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 106, address the Airworthiness Directives for Teledyne Continental Motors Piston Engines through AD/CON/61, which concerns crankshaft removal and inspection. The directive applies to all Teledyne Continental piston engines overhauled by or having their crankshaft disassembled for major work by Arnhem Aircraft Engineering Pty Ltd between 1 January 1990 and 6 August 1992 (section 10/92). The directive requires that the crankshaft assembly be removed from these engines and that the diameters of all bearing journals be dimensionally checked (section 1). If any bearing journal diameter is found to be less than the standard dimension listed in the relevant Teledyne Continental Engine Overhaul Manual, the crankshaft must be quarantined, and the local CAA Airworthiness District Office must be notified (section 2). Conversely, if all bearing journal diameters meet the standard dimensions, the crankshaft can be refitted to an engine (section 3). For engines already installed, these checks must be completed before 31 August 1992, while for uninstalled engines, the checks must be conducted before installation into an aircraft. The obligations imposed by this directive include ensuring that all affected engines undergo the specified crankshaft inspection process. This entails the removal of the crankshaft assembly and a thorough dimensional check of all bearing journals. The results of these checks must be reported to the relevant authorities if any bearing journal diameters are found to be substandard. Additionally, any crankshafts that do not meet the specified standards must be quarantined and reported to the CAA Airworthiness District Office. The directive also mandates that the inspections for installed engines must be completed by a specific date, 31 August 1992, while uninstalled engines must be inspected before they are installed in an aircraft. Failure to comply with the requirements of this Airworthiness Directive can result in serious consequences. If an engine with a substandard crankshaft is operated without proper inspection and notification, it could lead to safety issues, including potential engine failure. The directive does not explicitly state penalties or specific civil or criminal consequences for non-compliance; however, the implications of operating an unsafe aircraft can be severe, including potential legal action, fines, or other regulatory sanctions imposed by the Civil Aviation Safety Authority (CASA). The overarching aim of these provisions is to ensure the safety and airworthiness of aircraft by mandating rigorous checks on engine components that have been identified as potentially faulty.