AD/PT6A/12 - Improved Wire Rope Reversing Cable

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, aim to establish and maintain high standards of safety and efficiency within the civil aviation industry. This legislation is instrumental in addressing the need for stringent regulatory frameworks to govern the operation of aircraft and associated activities, ensuring public safety and national security. A specific focus of these regulations is the Civil Aviation Safety Authority (CASA), which is tasked with enforcing compliance with safety directives and standards. The policy objective of these regulations is to ensure the safety and efficiency of civil aviation operations through comprehensive oversight, regular review, and enforcement of safety directives, such as the Airworthiness Directives (AD) concerning Pratt and Whitney Canada Turbine Engines - PT6A Series. This particular directive, AD/PT6A/12, was introduced to address safety issues related to the wire rope reversing cable of the PT6A series engines, ensuring that such engines meet the necessary safety standards before being reinstalled in aircraft.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, outlines the scope and application of the Civil Aviation Safety Authority (CASA) schedule of airworthiness directives. This particular directive, AD/PT6A/12, pertains to Pratt and Whitney Canada's PT6A Series turbine engines, specifically the PT6A-27 and PT6A-28 engines. The directive applies to all PT6A-27 engines with serial numbers prior to PC-E40273, excluding certain engines listed by their serial numbers, as well as PT6A-28 engines before serial number PC-E50027. Compliance with this directive is mandatory for all engines that are intended for installation in an aircraft after their next reconditioning, which must be completed following 31 December 1971. The directive ensures that the improved wire rope reversing cable is installed, referencing specific documents for compliance. It should be noted that this directive applies nationally within the Commonwealth of Australia, and its application may be further extended or restricted by subordinate instruments issued by CASA.

Key Provisions

The Civil Aviation Regulations 1998, specifically within Part 39, include the provisions under the Schedule of Airworthiness Directives for Pratt and Whitney Canada Turbine Engines - PT6A Series. The directive AD/PT6A/12 focuses on the improved wire rope reversing cable for certain PT6A engines, as outlined in section 106 (1). The directive applies to all PT6A-27 engines before serial number PC-E40273, excluding specific engines listed, and PT6A-28 engines before serial number PC-E50027. Compliance with this directive is mandatory for the specified engines, requiring the installation of an improved wire rope reversing cable before the next reconditioning after 31 December 1971 (section 106(2)). The obligations imposed by this directive are clear: any aircraft operator or maintenance entity must ensure that the specified PT6A engines are fitted with the improved wire rope reversing cable as per the directive. The directive references UACL SB No. 173, Rev. 2; UACL SB No. 1126; or AD/UAC-T/10A as the documents that detail the compliance requirements (section 106(3)). This involves verifying the engine serial number, ensuring the appropriate modifications have been made, and documenting the compliance within the aircraft’s maintenance records. Failure to comply with the provisions set out in the directive may lead to serious consequences. Under the Civil Aviation Act 1988, non-compliance can result in civil penalties, including fines up to $275,000 for corporations and $55,000 for individuals (section 106(4)). Additionally, continued operation of an aircraft that does not meet the airworthiness standards set by this directive may be considered an offence under the Civil Aviation Regulations 1998, potentially leading to criminal charges and penalties (section 106(5)). The seriousness of these consequences underscores the importance of adhering to the directive to ensure the safety and airworthiness of the aircraft.