AD/T53/12 - Fuel Regulator Main Pressure Regulator Valve Diaphragm Replacement

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, were introduced to establish and maintain a comprehensive regulatory framework for civil aviation safety, thereby addressing gaps in aviation safety standards and ensuring the protection of life and property. One specific legislative instrument under this regulation is the AlliedSignal (Lycoming) Turbine Engines - T53 Series AD/T53/12, which concerns the replacement of the fuel regulator main pressure regulator valve diaphragm in certain T53 engines. This directive was established to mitigate potential safety risks associated with the specified engine components manufactured within a particular timeframe, aiming to ensure the continued airworthiness and safety of the affected aircraft. The Civil Aviation Safety Authority (CASA) issued this airworthiness directive to address specific safety concerns identified with the fuel regulator main pressure regulator valve diaphragm in certain T53 engines. The directive mandates compliance by a specified date, ensuring that these critical components are replaced to prevent potential failures that could compromise the safety of the aircraft. The overarching policy objective is to maintain high safety standards within Australia's civil aviation sector by proactively addressing and rectifying identified safety issues.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 106, pertains to the Civil Aviation Safety Authority's schedule of airworthiness directives. This legislation is applicable to all T53-07, 09, 11, 13 Series and T53-L-9, -11, -13 Series engines that are equipped with fuel regulator main pressure regulator valve diaphragms identified by the part number 78958 and having a cure date between 1 July 1973 and 30 June 1974, specifically identified as 3Q73, 4Q73, 1Q74, and 2Q74. The regulation applies at the Commonwealth level, ensuring compliance across Australia with federal aviation safety standards. This directive does not extend to engines outside the specified series or part numbers. Compliance must be achieved before 30 August 1974, as referenced in Lycoming Alert SB No. 0040 or AD/LYC-T/13. The Act does not specify any exclusions or exemptions in the provided text, but the scope is strictly limited to the mentioned engine series and diaphragm part numbers.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39, Section 106, outlines the requirements for airworthiness directives issued by the Civil Aviation Safety Authority (CASA). The relevant directive AD/T53/12 pertains to the replacement of the fuel regulator main pressure regulator valve diaphragm in certain AlliedSignal (Lycoming) turbine engines of the T53 series. This directive (AD/T53/12) applies to engines with specific production dates and part numbers, namely those with a cure date between 1 July 1973 and 30 June 1974 (3Q73, 4Q73, 1Q74, 2Q74), and with diaphragms P/N 78958 (Section 39.106(1)). Compliance with this directive is mandatory for all aircraft operators who have T53-07, 09, 11, 13 Series, and T53-L-9, -11, -13 Series engines that meet the specified criteria. The compliance date set forth in the directive is before 30 August 1974 (Section 39.106(2)). Operators are required to ensure that the identified engines are either inspected and, if necessary, the fuel regulator main pressure regulator valve diaphragm is replaced. The directive references Lycoming Alert SB No. 0040 or AD/LYC-T/13 for detailed instructions and specifications on how to conduct the necessary replacement (Section 39.106(3)). Failure to comply with the requirements outlined in AD/T53/12 can result in serious legal consequences. The Civil Aviation Regulations 1998 impose strict obligations on aircraft operators to adhere to all airworthiness directives. Non-compliance with these directives can lead to enforcement actions by CASA. In the event of a breach, CASA may issue enforcement notices or take other regulatory action. The potential penalties for non-compliance may include fines and other sanctions, which can have significant implications for the operation and certification of the aircraft involved (Section 39.106(4)). The specific maximum penalties for such breaches are detailed in the broader Civil Aviation Act 1988, which can include substantial fines and other civil or criminal penalties as deemed appropriate by the court.