AD/ELECT/63 Amdt 1 - TCM (Bendix) Magneto Capacitor

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, address the need for stringent safety standards in the aviation sector, particularly focusing on the airworthiness of aircraft components. This legislation, overseen by the Civil Aviation Safety Authority, aims to ensure that all aspects of aviation, including electrical equipment, adhere to stringent safety directives to prevent incidents such as those involving faulty magneto capacitors. The specific Airworthiness Directive AD/ELECT/63 Amendment 1, pertaining to TCM (Bendix) Magneto Capacitors, was introduced to address a safety issue identified in certain Teledyne Continental Motors (TCM) magneto models. The problem it sought to resolve involved the potential for capacitors in specific batch lots to develop an intermittent open circuit condition, which could lead to a hazardous situation where the magneto remains active even when switched off. This directive mandates specific inspections and corrective actions to ensure compliance and maintain the high safety standards required in civil aviation. The policy objective behind this amendment is to safeguard the integrity of the electrical systems in aircraft by ensuring that any defects in critical components, such as magneto capacitors, are identified and rectified promptly. By setting precise compliance timelines and referencing critical service bulletins and priority letters, the directive underscores the importance of timely and effective action to mitigate potential risks. This legislative measure ensures that the aviation industry adheres to rigorous safety protocols, thereby protecting both the public and aviation personnel from the dangers posed by defective equipment.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107, which pertains to the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to certain electrical equipment within civil aviation. More precisely, AD/ELECT/63 Amendment 1 TCM (Bendix) Magneto Capacitor pertains to Teledyne Continental Motors (TCM) Ignition Systems, specifically their new or rebuilt magnetos models SC-20, SC-200, and S-1200, that fall within specified manufacturing serial numbers. This directive also applies to all TCM or Bendix model SC-20, SC-200, and S1200 magnetos that have had a replacement capacitor part number 10-349276 fitted after 27 October 1993. The regulation is designed to address an intermittent open circuit condition in certain capacitors, which could lead to a "hot magneto" condition, where the magneto remains grounded even when the magneto/ignition switch is off. The requirement is for action to be taken in accordance with Teledyne Continental Ignition Systems' Critical Service Bulletin CSB641 dated 1 February 1994. Compliance with this directive is mandatory, with the original compliance deadline set at ten hours of time in service after 25 March 1994, and the amendment requiring compliance within 50 hours of time in service from 18 August 1994, if not previously completed under the original directive.

Key Provisions

The Civil Aviation Regulations 1998, Part 39, under the Airworthiness Directives, specifically in AD/ELECT/63 Amendment 1 TCM (Bendix) Magneto Capacitor, mandates that certain Teledyne Continental Motors (TCM) Ignition Systems magnetos must be inspected and possibly replaced if they meet the specified criteria. This directive applies to TCM Ignition Systems magnetos Models SC-20, SC-200 and S-1200 with certain manufacturing serial numbers (section 1). Additionally, it applies to all TCM or Bendix magnetos of these models that have been fitted with a replacement capacitor Part Number 10-349276 after 27 October 1993 (section 2). The action required is to follow the instructions detailed in the Teledyne Continental Ignition Systems Critical Service Bulletin CSB641 dated 1 February 1994. Compliance with this directive must occur within a specific timeframe, with original compliance required within ten hours of the directive's issue date of 25 March 1994, and amendment compliance within 50 hours of the amendment issue date of 18 August 1994, unless previously addressed (section 4). The obligations under this directive include conducting an inspection to determine if the capacitor is part of the affected batch lots (93-40 and 93-42) and shows signs of an intermittent open circuit condition. If the capacitor is found to be faulty, it must be replaced. This is crucial to prevent a condition known as a 'Hot Magneto,' where the magneto is not properly grounded when the ignition switch is turned off, potentially leading to safety issues. The directive also includes a provision for documenting the inspection and any corrective actions taken. Failure to comply with the requirements of this Airworthiness Directive may result in civil or criminal penalties. While the specific penalties are not detailed within this directive, non-compliance with Civil Aviation Regulations can generally lead to enforcement actions by the Civil Aviation Safety Authority (CASA), including fines, suspension or revocation of airworthiness certificates, and in severe cases, criminal prosecution. The exact penalties would depend on the severity of the non-compliance and any resulting safety risks. The directive notes that the issue was identified through quality assurance testing and is related to specific batch lots of capacitors. This highlights the importance of adhering to manufacturer service bulletins and ensuring that maintenance actions are taken promptly to address potential safety issues. The amendment corrects the serial number range of the affected magnetos to ensure that all potentially affected units are identified and addressed.