AD/ALF/15 - Fuel Manifold Inspections

Overview

The Civil Aviation Regulations 1998, as amended by the Civil Aviation (AlliedSignal Turbine Engines) Amendment Regulations 2006, were enacted to address the safety issues associated with AlliedSignal (Lycoming) ALF502 and LF507 series turbine engines, specifically targeting the cracking of fuel manifold assemblies. These regulations were introduced to mitigate the risks of fuel leaks and potential in-flight fires, ensuring the safety of aircraft operations. The enactment was overseen by the Commonwealth of Australia, with the Civil Aviation Safety Authority (CASA) being the relevant regulatory body. The overarching policy objective is to maintain and enhance the safety standards of civil aviation through rigorous oversight and directive adherence, as evidenced by the requirement for inspecting and replacing fuel manifold assemblies as per specified service bulletins.

Scope and Application

The Civil Aviation Safety Authority's Airworthiness Directive AD/ALF/15, issued under the Civil Aviation Regulations 1998, applies to all AlliedSignal ALF502 and LF507 series engines that incorporate a fuel manifold listed in AlliedSignal Service Bulletin ALF/LF 73-1002. This directive is geographically and jurisdictionally applicable within the Commonwealth of Australia, as it pertains to civil aviation safety and is enforced by the Civil Aviation Safety Authority. The directive mandates an inspection of the affected fuel manifold assemblies in accordance with the specified AlliedSignal Service Bulletin, with the replacement of both left-hand and right-hand fuel manifolds with improved manifold assemblies, P/No 2-163-620-37 and -38, serving as the terminating action for this directive. Compliance with this directive is essential to address issues of cracking in the fuel manifold assembly, which has resulted in fuel leaks and a potential risk of in-flight fires. The directive became effective on 14 August 1997, and adherence to later issues of the referenced service bulletin also satisfies the directive's intent. It is noteworthy that FAA AD 97-11-05 is referenced in relation to this directive, indicating a cross-jurisdictional recognition of the issue at hand.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 106, mandates inspections and replacement of certain fuel manifold assemblies for AlliedSignal ALF502 and LF507 series turbine engines. Section 106 of the regulations introduces an Airworthiness Directive (AD) pertaining to these engines, identified as AD/ALF/15. This directive applies to all engines that incorporate a fuel manifold listed in AlliedSignal Service Bulletin ALF/LF 73-1002. The requirement is to inspect the affected fuel manifold assemblies in accordance with the specified service bulletin. If both the left-hand (L.H.) and right-hand (R.H.) fuel manifolds are replaced with improved manifold assemblies (P/No 2-163-620-37 and -38), it is considered the terminating action for this directive. The directive notes that compliance with later issues of the referenced service bulletin also satisfies its intent. The directive became effective on 14 August 1997, following reports of cracking in the fuel manifold assembly, which has led to fuel leaks and potential in-flight fires. The obligations imposed by this directive are clear and specific. Operators of AlliedSignal ALF502 and LF507 series engines must ensure that the inspections and any necessary replacements are carried out in accordance with the detailed instructions provided in AlliedSignal Service Bulletin ALF/LF 73-1002. This involves a thorough inspection of the fuel manifold assemblies and replacing them with the specified improved assemblies if required. The directive mandates that compliance with these instructions is necessary to maintain the airworthiness of the engines and to mitigate the risks associated with fuel leaks and in-flight fires. The consequences for non-compliance with this directive can be significant. While the regulations do not explicitly state civil or criminal penalties for breaches, non-compliance could result in the aircraft being deemed unairworthy. This could lead to grounding of the aircraft until the required inspections and repairs are completed. Furthermore, in the event that non-compliance results in an accident or incident, operators and relevant parties could face severe civil and criminal liabilities, including fines and imprisonment. The exact penalties would depend on the specific circumstances of the breach and any resulting harm or damage.