AD/CON/72 - Engine Mount Bracket

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, aim to ensure the safety of civil aviation through comprehensive regulations and directives. One such directive, AD/CON/72, was introduced to address the problem of cracking in the lower left engine mount brackets of Teledyne Continental Motors piston engines. This issue, identified by the manufacturer, posed a risk of engine separation during flight, thereby threatening the safety of aircraft and their occupants. The directive mandates specific inspections and, where necessary, replacement of these brackets with improved designs to mitigate the risk and maintain airworthiness. This directive reflects the policy objective of continuously enhancing aviation safety by responding promptly to identified mechanical issues and ensuring adherence to stringent safety standards.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106 concerning the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, applies to certain Teledyne Continental Motors piston engines used in various aircraft models. This regulation mandates inspections and replacement of specific engine mount brackets for engines of the Series IO-346A, IO-346B, IO-520C, IO-520CB, and rebuilt models of IO-520C and IO-520CB with particular serial numbers, as well as all factory overhauled IO-520C, IO-520CB and IO-550C engines built before a specified date. These engines are commonly installed in a range of Beech aircraft models. The directive ensures safety by requiring inspections for cracks in the lower left engine mount bracket and the replacement of both the lower left and right engine mount brackets with improved designs. The regulation applies across the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority, and compliance is mandatory for the specified engine types and models. There are no exclusions or exemptions stated in this particular directive.

Key Provisions

The main provisions of the Civil Aviation Regulations 1998, specifically in PART 39 - 106, concern the inspection and replacement of engine mount brackets on certain Teledyne Continental Motors piston engines. These engines include series IO-346A, IO-346B, IO-520C, IO-520CB, and specific rebuilt models with particular serial numbers. The requirements outlined in AD/CON/72 focus on addressing potential cracking in the lower left engine mount bracket, identified as P/N 630695, and the corresponding lower right engine mount bracket, identified as P/N 630694. The directive mandates the inspection of these brackets using a dye penetrant technique as per CAO 108.10, Appendix 2, and the replacement of the brackets with improved design brackets P/N 653306 and P/N 653305, respectively, once they are removed for engine overhaul. The obligations imposed by this Act on the parties governed by it are primarily centered around the inspection and maintenance of the specified engine mount brackets. For engines that have completed one or more overhaul cycles or have accumulated 2,500 or more hours of time in service by 5 January 1995, the lower left engine mount bracket must be inspected within 50 hours of time in service. This inspection must then be repeated at intervals not exceeding 500 hours since the last inspection. Should any cracking be detected, the brackets must be replaced before further flight. For all other engines, the replacement of the brackets must occur at the next engine removal after 5 January 1995. Failure to comply with these requirements can lead to serious consequences. While the specific penalties for non-compliance are not detailed in the excerpt, it is implied that breaches of these safety directives can result in severe repercussions. Such consequences could include the grounding of aircraft, financial penalties, and potential criminal charges. The exact nature and severity of the penalties would depend on the specific regulatory framework under which the violations occur, but the overarching theme is that adherence to these safety directives is mandatory to ensure the safety and airworthiness of the aircraft involved.