AD/JT15D/4 Amdt 2 - Engine Overspeed Fuel Shut-Off System

Overview

The Civil Aviation Regulations 1998, amended through Legislative instrument F2006B10967, were enacted to ensure the safety and reliability of civil aviation operations within Australia. This legislation, overseen by the Australian Parliament, aims to safeguard the integrity of aircraft and their operations by issuing directives that address specific safety concerns. One such directive pertains to Pratt and Whitney Canada Turbine Engines, specifically the JT15D series, as outlined in the Airworthiness Directive AD/JT15D/4 Amendment 2. This directive was introduced to address the potential risk of engine overspeed, which could lead to catastrophic failure. The policy objective is to mandate modifications to the engine's overspeed fuel shut-off system, ensuring that engines are equipped with updated components as specified by Pratt and Whitney Canada's service bulletins, thereby enhancing the overall safety of aircraft operations.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, addresses the requirements for airworthiness directives concerning Pratt and Whitney Canada Turbine Engines of the JT15D series. This legislative instrument applies to all JT15D engines, mandating modifications to ensure compliance with safety standards. The requirement includes modifying the engine overspeed fuel shut-off control wire rope assembly according to Pratt and Whitney Canada Service Bulletin Number 7288 and modifying the engine overspeed fuel shut-off control linkage assembly in accordance with Service Bulletin Number 7306. The compliance timeline dictates that these modifications must occur at the next engine disassembly providing access to the affected parts, but no later than 31 December 1992, and at the next engine overhaul. This directive ensures that all operators and maintainers of JT15D engines adhere to the specified safety modifications, maintaining the integrity and safety of aviation operations.

Key Provisions

The Civil Aviation Regulations 1998, specifically under PART 39 - 106, issue an Airworthiness Directive (AD) concerning Pratt and Whitney Canada Turbine Engines of the JT15D series. The directive, identified as AD/JT15D/4Amdt 2, pertains to the engine overspeed fuel shut-off system. The directive applies to all JT15D engines (Section 1). It mandates two specific modifications to ensure the safety and compliance of these engines with current standards. Firstly, the engine overspeed fuel shut-off control wire rope assembly must be modified in accordance with Pratt and Whitney Canada Service Bulletin Number 7288 (Section 1(1)). Secondly, the engine overspeed fuel shut-off control linkage assembly must be modified in accordance with Pratt and Whitney Canada Service Bulletin Number 7306 (Section 1(2)). The directive notes a reference to Transport Canada AD CF-91-37 for additional context. Compliance with this directive is critical and is to be achieved in two key instances. Firstly, the modifications must be implemented at the next engine disassembly that provides access to the affected parts, but no later than 31 December 1992 (Section 2(1)). Secondly, the modifications must also be completed during the next engine overhaul (Section 2(2)). These provisions ensure that the safety enhancements are applied as soon as practically possible to all affected engines. The consequences of non-compliance with this directive are significant. While specific penalties are not detailed in the directive itself, non-compliance with Civil Aviation Regulations can lead to serious civil and criminal consequences. Civil penalties may include fines and other enforcement actions, while criminal penalties can include imprisonment, depending on the severity and intent of the violation. The exact penalties would be determined under the broader regulatory framework of the Civil Aviation Act 1988 and related regulations, which impose strict compliance measures to maintain the highest standards of aviation safety.