AD/ELECT/38 - Bendix Distributor Gear Electrode - Inspection/Replacement

Overview

The Civil Aviation Regulations 1998, as amended by the Civil Aviation Amendment (Enhancing Aviation Safety) Regulations 2006, encompass the regulatory framework for civil aviation safety in Australia. Specifically, Part 39 addresses Airworthiness Directives (ADs) aimed at ensuring the safe operation of aircraft. AD/ELECT/38 focuses on the inspection and replacement of the Bendix distributor gear electrode in certain D-3200 series pressurised magnetos. This directive was introduced to address a safety issue identified with the distributor gear electrode coming loose in service, which could lead to engine misfiring, rough engine operation, and potential engine damage. The policy objective is to maintain the airworthiness of aircraft by preventing such malfunctions and ensuring compliance with safety standards set by the Civil Aviation Safety Authority (CASA). The regulations are enacted by the Australian Parliament to ensure that aircraft operations adhere to stringent safety requirements.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 107 Civil Aviation Safety Authority Schedule of Airworthiness Directives, mandate the inspection and replacement of the Bendix Distributor Gear Electrode for certain aircraft models. This regulation applies to all D-3200 Series pressurised (blue) magnetos with specific serial numbers installed on Avco Lycoming engines used in various aircraft types, including Piper PA31-350 and conversions of PA31 models, as well as NW Machen Industries conversions of Piper Aerostar 600 and Beechcraft Bonanza B35 and A36 series. The directive aims to prevent potential engine misfiring and subsequent damage caused by the electrode coming loose and causing arcing within the distributor. Compliance with this directive requires inspections within 100 hours of time in service after 31 August 1981, and thereafter at intervals not exceeding 100 hours if the gears pass inspection and are not replaced. This legislation ensures that the specified aircraft maintain airworthiness and operational safety.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 107, mandate adherence to the Civil Aviation Safety Authority (CASA) schedule of airworthiness directives, which include detailed requirements for the maintenance and inspection of aircraft electrical equipment. One such directive is AD/ELECT/38 (paragraph 107.B093), which pertains to the Bendix distributor gear electrode of specific D-3200 series pressurised magnetos. This directive applies to magnetos with serial numbers ranging from 100 to 1422 installed on Avco Lycoming TIO-540-J2BD engines used on Piper PA31-350 and LTIO-540-J2BD engines used on various STC conversions (section 1). The requirement is for the inspection and, if necessary, the replacement of the Bendix distributor gear electrode within 100 hours of time in service after 31 August 1981, and thereafter at intervals not exceeding 100 hours (section 3). The obligations imposed by this directive are clear and specific. Aircraft operators must ensure that the Bendix distributor gear electrode is inspected and replaced if necessary, adhering to the outlined intervals. The inspection must be thorough to ensure that the electrode is securely fastened and free from contamination that could cause arcing and subsequent engine issues (section 4). This inspection must be carried out by a licensed aviation maintenance engineer who is certified to work on these specific types of magnetos (section 5). Failure to comply with these directives can lead to serious consequences. If an aircraft is found to be operating with a defective Bendix distributor gear electrode, it may be deemed unairworthy by CASA. This can result in the grounding of the aircraft, which can significantly impact operations and potentially lead to hefty fines or other penalties. The maximum penalties for non-compliance are severe, reflecting the critical safety implications of such oversights. Operators found in breach of these regulations could face substantial financial penalties, and in the most severe cases, criminal charges could be brought against responsible individuals (section 7).