AD/TPE 331/10 - High Speed Pinion Bearing Assembly - Replacement

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, address the need for stringent safety measures in civil aviation. Specifically, the regulations aim to ensure that aircraft and related components meet safety standards to protect passengers, crew, and the general public. The Civil Aviation Safety Authority (CASA) is responsible for enforcing these regulations, which include the issuance of airworthiness directives to maintain safety standards. One such directive, AD/TPE 331/10, pertains to the replacement of the high-speed pinion bearing assembly in specific AlliedSignal (Garrett/AiResearch) Turbine Engines of the TPE 331 series. This directive applies to various models of these engines and requires compliance with specified service bulletins or airworthiness directives before installation in aircraft following their next major reconditioning after 31 May 1977. The policy objective is to mitigate the risk of mechanical failure and ensure the continued airworthiness of the affected aircraft.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, under the authority of the Civil Aviation Safety Authority, mandates that certain AlliedSignal (Garrett/AiResearch) Turbine Engines of the TPE 331 Series must adhere to specified Airworthiness Directives. This legislation applies to the models TPE-331-1-100F, 101B, 101E, 101F, 101J, 101L, 151A, 151G, TPE-331-2-201A, 201C, and TPE-331-2UA-203D, requiring the replacement of the High Speed Pinion Bearing Assembly in compliance with the directives outlined in AiResearch TPE-331 SB 632, Rev. 3, or AiResearch TPE-331 SB 72-0064, or AD/AIR-T/11. This directive necessitates compliance prior to the installation of the engine in an aircraft following its next major reconditioning, provided that the reconditioning is completed after 31 May 1977. The regulations are applicable on a Commonwealth level, ensuring that all civil aviation activities within Australia comply with the stipulated safety requirements. Subordinate instruments may further extend or restrict the application of these directives as necessary.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 106 and the Civil Aviation Safety Authority Schedule of Airworthiness Directives, address the safety requirements for AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series. A key provision of this legislation is AD/TPE 331/10, which mandates the replacement of the High Speed Pinion Bearing Assembly (section 3/86). This directive applies to specific models of the TPE 331 series, including TPE-331-1-100F, 101B, 101E, 101F, 101J, 101L, 151A, 151G, TPE-331-2-201A, 201C, and TPE-331-2UA-203D. Compliance with this directive must be evidenced by referencing either AiResearch TPE-331 SB 632, Rev. 3; or AiResearch TPE-331 SB 72-0064, or AD/AIR-T/11. The directive requires that the specified bearing assembly replacement occur before the engine is installed in an aircraft following its next major reconditioning, and this must be completed after 31 May 1977. The obligations under this Act require all operators of the specified TPE 331 series engines to ensure that the High Speed Pinion Bearing Assembly replacement is conducted as mandated. This entails adherence to the technical bulletins AiResearch TPE-331 SB 632, Rev. 3; or AiResearch TPE-331 SB 72-0064, or AD/AIR-T/11. Operators must ensure that the replacement is performed before the engine undergoes its next major reconditioning after the specified date. Additionally, records of compliance must be maintained and made available for inspection by the Civil Aviation Safety Authority (CASA) upon request. Failure to comply with the provisions outlined in AD/TPE 331/10 can result in significant consequences. The Act does not explicitly state the penalties for non-compliance; however, generally under the Civil Aviation Act 1988, breaches of airworthiness directives can lead to civil penalties, including fines, as well as potential criminal charges if the breach results in significant harm or endangers safety. CASA has the authority to enforce these regulations, and repeated or severe non-compliance could lead to more stringent measures, including the grounding of non-compliant aircraft or suspension of airworthiness certificates.