AD/TFE 731/4 - Transfer Bearing Support - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, constitute a comprehensive legal framework governing the safety and operational standards within Australia's civil aviation industry. These regulations are essential in ensuring that all aspects of civil aviation, including aircraft, pilots, and air navigation services, adhere to the highest safety standards. Specifically, Part 39, which includes the 106 Schedule of Airworthiness Directives, addresses the ongoing airworthiness of aircraft and their components by setting out mandatory safety directives that must be followed by operators and maintenance personnel. One such directive, AD/TFE731/4, pertains to the inspection of transfer bearing supports in AlliedSignal (Garrett/AiResearch) Turbine Engines of the TFE731 series, aiming to prevent potential failures that could compromise flight safety. The policy objective behind these regulations is to maintain and enhance the safety of civil aviation by imposing stringent requirements and oversight on all entities involved in the industry. The Civil Aviation Safety Authority (CASA) enforces these regulations, ensuring compliance through regular inspections and audits. The specific directive AD/TFE731/4 mandates that inspections of the transfer bearing support be conducted within 25 hours of time in service after 31 March 1977 and subsequently at intervals not exceeding 50 hours of time in service until the engines are modified to meet the AiResearch SB TFE 731-72-3020 standard. This directive underscores the importance of proactive maintenance and adherence to safety protocols to mitigate risks associated with engine failures, thereby safeguarding both passengers and crew.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, governs the airworthiness directives under the oversight of the Civil Aviation Safety Authority. This regulation applies to the AlliedSignal (Garrett/AiResearch) Turbine Engines of the TFE731 series, namely the TFE 731-2-1C, -2-2B, -3-1E, and -3-1G variants, provided they have not been modified to meet the SB TFE 731-72-3020 standard. The directive mandates that these engines undergo inspection of the transfer bearing support. The compliance period requires an inspection within 25 hours of time in service after 31 March 1977 and subsequently at intervals not exceeding 50 hours of time in service until the engines are modified according to the specified standard. This regulation has a national reach, affecting all relevant engines operating within Australian jurisdiction, with no stated exclusions or exemptions within the scope of this particular directive. The application of these regulations may be extended or modified through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39, establish the framework for ensuring the safety of civil aviation in Australia. One specific section, AD/TFE731/4, pertains to the inspection of the transfer bearing support for AlliedSignal (Garrett/AiResearch) Turbine Engines of the TFE731 Series (section 106). This section mandates that certain TFE 731 models, specifically the -2-1C, -2-2B, -3-1E, and -3-1G, which have not been modified to the SB TFE 731-72-3020 standard, must undergo inspection. This inspection is to be conducted within 25 hours of time in service after 31 March 1977 and then at intervals not exceeding 50 hours of time in service until the engines are modified as per the SB TFE 731-72-3020 standard. Entities and operators governed by these regulations are required to comply with the outlined inspection intervals and procedures. This includes ensuring that the inspections are performed by certified personnel using the specified documents: AiResearch SB TFE 731-72-2019, FAA AD 75-07-10 Amdt 39-2189, or AD/AIR-T/31. The compliance with these directives is essential for maintaining the airworthiness of the affected turbine engines, thereby ensuring safety in civil aviation operations. Failure to comply with the stipulated inspection intervals and procedures can result in serious consequences. The Civil Aviation Regulations 1998 impose penalties for non-compliance, which may include both civil and criminal sanctions. The exact nature and severity of these penalties can vary, but they are intended to enforce adherence to safety standards. Operators who fail to adhere to these regulations risk not only financial penalties but also the potential grounding of non-compliant aircraft, which could lead to further safety hazards and disruptions in air travel. The specific penalties are not detailed within the excerpt but are generally severe enough to ensure compliance with safety directives.