AD/T53/8 - Second Stage Power Turbine Rotor Disc - Rework

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 106, address the critical need for ensuring the safety and airworthiness of aircraft within Australia. Enacted by the Australian Parliament, this legislative instrument was designed to fill the gap in maintaining stringent standards for aviation safety. One of the directives under this regulation, AD/T53/8, pertains to the rework of the second stage power turbine rotor disc for AlliedSignal (Lycoming) Turbine Engines in the T53 Series, particularly models T5313A, T5313A S/N Suffix "A", and T5313B. The policy objective behind this directive is to enhance the safety and reliability of these critical components through specified modifications and compliance requirements, ensuring that they meet stringent safety standards before being reinstalled in aircraft following reconditioning. The regulation specifies compliance with either Lycoming Overhaul Modification Bulletin No. 0041, Revision 3, or AD/LYC-T/9B, and mandates that any reconditioning of the specified engine models must be completed prior to installation in an aircraft following the next reconditioning after 31 July 1973. This ensures that all modifications are performed in accordance with the highest safety standards, thereby contributing to the overall safety and airworthiness of aircraft operating within Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106 Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to certain AlliedSignal (Lycoming) Turbine Engines of the T53 series, including the T5313A, T5313A S/N Suffix "A", and T5313B. This regulation is essential for ensuring the airworthiness of these particular engine types, mandating specific rework on the second stage power turbine rotor disc. The directive requires compliance with either Lycoming Overhaul Modification Bulletin No. 0041, Revision 3, or AD/LYC-T/9B. The rework must be completed prior to the next reconditioning of the engine and must be done after 31 July 1973. The regulation applies to all aircraft utilising these engine types, ensuring that the specified rework is implemented to maintain safety standards across the industry. This directive operates within the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority, ensuring adherence to national safety standards.

Key Provisions

The key provisions of the Civil Aviation Regulations 1998, particularly under Part 39, Section 106, focus on the AlliedSignal (Lycoming) Turbine Engines - T53 Series and mandate specific requirements for maintaining airworthiness. Specifically, AD/T53/8 addresses the rework of the Second Stage Power Turbine Rotor Disc (paragraph 1). The applicability of these regulations extends to T5313A, T5313A S/N Suffix "A", and T5313B engines (paragraph 2). Compliance with these directives necessitates adherence to either Lycoming Overhaul Modification Bulletin No. 0041, Rev. 3, or AD/LYC-T/9B (paragraph 3). Furthermore, any reconditioning of these engines must be completed prior to installation in an aircraft, following the next reconditioning done after 31 July 1973 (paragraph 4). The Civil Aviation Regulations 1998 impose clear obligations on the entities governed by these provisions. Aircraft operators and maintenance providers must ensure that the Second Stage Power Turbine Rotor Disc of the specified Lycoming T53 Series engines undergoes the required rework as outlined in the Lycoming Overhaul Modification Bulletin or AD/LYC-T/9B. This ensures that the engine components meet the necessary safety and airworthiness standards. Operators must also verify that any reconditioning work complies with the stipulated timeline, specifically that it is performed after 31 July 1973, to maintain the engine's airworthiness certification. Failure to comply with the mandates of the Civil Aviation Regulations 1998, particularly in relation to the rework of the Second Stage Power Turbine Rotor Disc of the Lycoming T53 Series engines, can lead to serious consequences. The regulations do not explicitly state the penalties for non-compliance in this context, but general civil aviation safety regulations often include hefty fines and potential criminal charges for violations that could endanger aviation safety. Such penalties may also include suspension or revocation of the aircraft's operating certificate, which could significantly disrupt operations and result in costly delays.