AD/LYC/99 - Diaphragm Fuel Pumps

Overview

The Civil Aviation Regulations 1998, amended through F2006B11217, was enacted to address safety concerns related to the airworthiness of certain Lycoming piston engines, specifically those equipped with diaphragm fuel pumps. This legislative instrument was issued by the Civil Aviation Safety Authority to ensure compliance with airworthiness directives. The primary objective of this regulation is to mandate inspections of the specified fuel pumps to prevent sudden engine failures due to manufacturing defects. Compliance with these directives is crucial to maintain the safety standards of aircraft operations and to mitigate potential risks associated with the identified defect in the fuel pump diaphragm retaining washer.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, applies to all Lycoming fuel-injected piston engines that are either new, remanufactured, or overhauled, and which fall within the specified model numbers. The regulation mandates the inspection of diaphragm fuel pumps in these engines, focusing on those released by Textron Lycoming between 18 July 1995 and 14 August 1996 and those fitted with a diaphragm fuel pump part number LW-15473 with specific identification/date codes. Additionally, the directive applies to all Textron Lycoming fuel-injected engines that have had a new diaphragm fuel pump P/N LW-15473 with the specified codes installed since 18 July 1995, as well as to spare diaphragm fuel pumps with the same identification codes. The geographic reach of this regulation is national, applying across the Commonwealth of Australia, and it extends to all aviation entities operating within the country. Compliance must be achieved within specific timeframes: engines already installed must be inspected within 10 hours of time in service from 30 October 1996, while spare engines and fuel pumps must be inspected prior to installation in an aircraft from the same date. This directive is part of a broader regulatory framework aimed at ensuring the airworthiness and safety of civil aviation operations in Australia.

Key Provisions

The Civil Aviation Regulations 1998, Part 39, Section 106, specifically AD/LYC/99, mandates an inspection of certain Lycoming piston engines fitted with a diaphragm fuel pump. The directive applies to all Lycoming new, remanufactured, and overhauled fuel-injected engines, including models L/IO-320, -360, -540; AEIO-320, -360, -540; HIO-360, TO-360, and O-540-L, that were released by Textron Lycoming between 18 July 1995 and 14 August 1996. Additionally, the directive applies to engines that have had a new diaphragm fuel pump installed since 18 July 1995, as well as to all spare diaphragm fuel pumps with specific part numbers and identification codes. The primary requirement is that these fuel pumps must be inspected in accordance with Textron Lycoming Mandatory Service Bulletin No. 525. Compliance with the directive is essential for engines that have been installed, which must undergo inspection within 10 hours of time in service, effective from 30 October 1996. For engines that are still spare and for spare fuel pumps, inspection must occur prior to installation in an aircraft, also effective from 30 October 1996. Under the Civil Aviation Regulations 1998, the obligations imposed on parties and entities governed by this directive are quite specific. The directive mandates that Lycoming fuel-injected engines within the specified range and date of release, as well as those that have had a new diaphragm fuel pump installed since the specified date, must undergo inspection by a certified technician. This inspection must adhere to the guidelines provided in Textron Lycoming Mandatory Service Bulletin No. 525. This obligation extends to all engines that have been installed, which must be inspected within the first 10 hours of service, as well as to all spare engines and spare fuel pumps, which must be inspected before they are installed in an aircraft. This requirement ensures that any manufacturing defects that could lead to engine failure are identified and rectified before the engine is put into service. Failure to comply with the AD/LYC/99 directive can result in serious legal and safety consequences. While specific penalties are not detailed in the legislative instrument, non-compliance with Civil Aviation Regulations can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). The consequences of non-compliance can include fines, the grounding of non-compliant aircraft, and potential legal action against the operators or owners of the aircraft. The seriousness of the defect, which has been linked to sudden engine failure, underscores the importance of adhering to the inspection requirements. The directive aims to prevent engine failure events that could compromise the safety of air travel, and thus, any breaches of this directive could have severe ramifications both legally and in terms of public safety.