COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Allison Turbine Engines - 250 Series
AD/AL 250/51
Amdt 1
High Pressure Fuel Control Filter Assembly - Modification
6/83
Applicability: All models 250-C20, C20B and C20J engines fitted with CECO P/N 6895173 or P/N 6896727 high pressure fuel control filter assemblies.
Document: Allison 250-C20, C20B and C20J Alert CEB-A-1144, Rev. 4.
Note: FAA AD No. 82-13-03 refers.
Compliance: For model 250-C20 and C20B : Forthwith.
For model 250-C20J : Not later than 1st August 1983.
Background: This Directive is issued to prevent possible metal contamination of the CECO Model MC-40 fuel control system power turbine governor which can result in power turbine rotor overspeed. It is raised in issue to Amdt 1 to include the model C20J as specified in Revision 4 of the Allison Document.
Overview
The Civil Aviation Regulations 1998, specifically Part 39 - 106, establish a schedule of airworthiness directives that are critical for maintaining the safety and reliability of aircraft engines within Australia. This legislation was enacted by the Commonwealth of Australia to address the need for stringent safety measures in civil aviation, particularly concerning engine reliability and airworthiness. The problem this Act aimed to resolve was the potential for metal contamination in the high-pressure fuel control filter assemblies of Allison Turbine Engines - 250 Series, which could lead to significant operational hazards such as power turbine rotor overspeed. The Civil Aviation Safety Authority (CASA) is the enforcing body, with a clear policy objective to ensure that all relevant aircraft engines comply with the specified airworthiness directives to maintain high safety standards.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 106, under the Civil Aviation Safety Authority, mandate the application of Airworthiness Directives (AD) to ensure the safety and airworthiness of aircraft operating within Australia. This particular legislative instrument, AD/AL 250/51 Amendment 1, pertains to Allison Turbine Engines - 250 Series, focusing on the modification of the High Pressure Fuel Control Filter Assembly. The directive applies to all models 250-C20, C20B, and C20J engines that are fitted with CECO P/N 6895173 or P/N 6896727 high pressure fuel control filter assemblies. The objective of this directive is to prevent metal contamination that could lead to overspeed of the power turbine rotor, which is a significant safety concern. The directive references Allison 250-C20, C20B, and C20J Alert CEB-A-1144, Revision 4, and is also in line with FAA AD No. 82-13-03. Compliance is mandatory, with immediate action required for the 250-C20 and C20B models, and a deadline of 1st August 1983 for the 250-C20J model. The directive extends the applicability to include the model C20J as specified in Revision 4 of the Allison document.
Key Provisions
The Civil Aviation Regulations 1998, under Part 39, specifically Section 106, detail the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives. Section AD/AL 250/51 Amendment 1, dated from 6/83, addresses the high-pressure fuel control filter assembly modification for Allison Turbine Engines of the 250 Series. This regulation is applicable to all models 250-C20, C20B, and C20J engines that are equipped with CECO parts numbers 6895173 or 6896727 high-pressure fuel control filter assemblies. The directive references the Allison 250-C20, C20B, and C20J Alert CEB-A-1144, Revision 4, and notes the Federal Aviation Administration's (FAA) AD No. 82-13-03 for context.
The directive mandates compliance timelines and specific actions to be undertaken. For models 250-C20 and C20B, the compliance requirement is immediate, termed as "forthwith." However, for the model 250-C20J, compliance must be achieved no later than 1st August 1983. The purpose of this directive is to mitigate the risk of metal contamination in the CECO Model MC-40 fuel control system power turbine governor, which could potentially lead to power turbine rotor overspeed. This amendment extends the directive to include the model C20J as specified in the latest revision of the Allison Document.
The obligations imposed by this directive are clear and specific. Owners and operators of the affected aircraft must ensure that the modifications to the high-pressure fuel control filter assembly are carried out as specified. This involves adhering to the timelines provided and utilising the referenced documentation to ensure the modifications are performed correctly. Failure to comply with these requirements can lead to significant safety risks, potentially resulting in severe operational issues or accidents.
The consequences of non-compliance with these provisions can be severe. While specific penalties are not detailed in the excerpt, under the broader framework of the Civil Aviation Regulations 1998, non-compliance can result in enforcement actions, including fines, suspension of airworthiness certificates, and potential criminal charges. The severity of these consequences underscores the importance of adhering to the directive to maintain the safety and airworthiness of the aircraft.