AD/PT6A/7 - Re-Routing Of Governor Air Pressure Line

Overview

The Civil Aviation Regulations 1998, as amended by the legislative instrument F2006B06370, addresses the need for specific safety measures for Pratt and Whitney Canada PT6A Series turbine engines, particularly in relation to re-routing the governor air pressure line. This regulation was enacted by the Parliament of Australia under the authority of the Civil Aviation Act 1988. The primary problem this legislation was introduced to address is the safety risk associated with the governor air pressure line in certain PT6A engines, which could potentially lead to engine failure if not properly managed. The policy objective is to enhance aviation safety by ensuring that all applicable aircraft engines meet specific design and operational standards that mitigate identified risks. The Civil Aviation Regulations 1998, through this particular amendment, mandate that the re-routing of the governor air pressure line in PT6A-6, -6A, and 6B engines must be completed before any reconditioning after 15 April 1966. This requirement aims to ensure that any aircraft utilising these engines adheres to the latest safety directives, thereby reducing the risk of accidents stemming from engine failures. The regulations are enforced by the Civil Aviation Safety Authority, which oversees compliance with these safety directives to maintain high standards of safety in Australian civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, encompasses Airworthiness Directives (AD) that are critical for maintaining the safety standards of civil aviation in Australia. The referenced legislative instrument, AD/PT6A/7, applies to Pratt and Whitney Canada PT6A Series turbine engines, including PT6A-6, -6A, and -6B models prior to serial number PC-E20117. This directive mandates the re-routing of the governor air pressure line in compliance with documented instructions such as UACL SB No. 27, Rev. 2, UACL SB No. 1013, or AD/UAC-T/1A. The requirement is that these modifications must be completed before the engines are reinstalled in an aircraft following their next reconditioning, which must occur after 15 April 1966. The directive applies nationally within the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority (CASA), ensuring that all relevant entities and persons, particularly those involved in the maintenance and operation of aircraft using the specified engines, adhere to these safety standards. There are no exclusions, exemptions, or thresholds specified in this particular directive, and its application is not extended or restricted through subordinate instruments within the scope of this document.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 106, address the re-routing of the governor air pressure line for Pratt and Whitney Canada PT6A series turbine engines, as outlined in AD/PT6A/7 (1). The directive applies to PT6A-6, -6A and 6B engines with serial numbers prior to PC-E20117 (1). Compliance with this directive necessitates that the re-routing of the governor air pressure line is completed before the next reconditioning of the engine, following the installation in an aircraft after 15 April 1966 (1). The relevant technical documentation for compliance includes UACL SB No. 27, Rev. 2; UACL SB No. 1013; or AD/UAC-T/1A (1). Under this legislation, parties or entities governed by the Civil Aviation Regulations 1998 must ensure that any PT6A series turbine engines are re-routed according to the specified directive (1). This includes adherence to the serial number limitations and the requirement for compliance with the technical bulletins or airworthiness directives provided (1). Specifically, the engine must be reconditioned and the air pressure line re-routed before it is installed in an aircraft following the next reconditioning after the specified date (1). Failure to comply with the provisions outlined in AD/PT6A/7 may result in significant consequences. While the specific penalties or consequences are not detailed within the excerpt, the overarching framework of the Civil Aviation Regulations 1998 typically includes potential enforcement actions, fines, and operational restrictions for non-compliance (2). Non-compliance with airworthiness directives can also lead to the grounding of aircraft and other safety-related repercussions, impacting both the operators and the broader aviation safety framework (2). Therefore, adherence to these directives is crucial for maintaining the safety and airworthiness of the aircraft involved.