COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Turbomeca Turbine Engines - Arriel Series
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ARRIEL/7 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
AD/ARRIEL/7
Amdt 1
Module 5 Intermediate Pinion 10/2001
Applicability: Arriel 1A, 1A1, 1B, 1D and 1D1 engines.
Requirement: 1. Arriel 1B, 1D, 1D1 engines not incorporating modification TU 232 and Arriel 1A and 1A1 engines incorporating modification TU 13 but not incorporating modification TU 232;
Inspect reduction gearbox (module 5) magnetic plug for evidence of contamination, in accordance with Maintenance Manual chapter 72-80-01, pages 104 and 105.
2. Arriel 1A, 1A1 incorporating modification TU 13 but not incorporating modification TU 39 and Arriel 1B engine not incorporating modification TU 39;
Replace the reduction gearbox (module 5).
Note 1: DGAC AD 92-078(B) refers. Note 2: DGAC AD 92-078(B) refers.
Compliance: 1. At intervals not to exceed 8 hours engine time in service or daily, whichever occurs first.
2. Prior to further flight.
This amendment becomes effective on 4 October 2001.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Background: This Directive was originally issued to require repetitive inspection of the reduction gearbox magnetic plug and to remove from service, reduction gearboxes not incorporating a modified intermediate pinion. Unmodified gearboxes are more prone to intermediate pinion gear failure that may result in a possible turbine overspeed.
This amendment clarifies engine models applicable and amends the compliance intervals to reflect that detailed in the applicable Turbomeca service bulletin and DGAC airworthiness directive.
The original issue of this Airworthiness Directive became effective on 25 June 1992.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 13 August 2001
The above AD is notified in the Commonwealth of Australia Gazette on 12 September 2001.
Overview
The Civil Aviation Regulations 1998, specifically Part 39, were enacted to establish and maintain safety standards in civil aviation in Australia. The Civil Aviation Safety Authority (CASA) issues Airworthiness Directives (ADs) to address specific safety issues that may arise in aircraft or aeronautical products. This is achieved through the identification of unsafe conditions and the implementation of necessary actions to rectify them. One such AD, AD/ARRIEL/7, addresses the issue of potential turbine overspeed due to intermediate pinion gear failure in certain Arriel series turbine engines. This AD was introduced to enhance safety by mandating inspections and, where necessary, the replacement of reduction gearboxes in Arriel engines that do not incorporate specific modifications. The directive was issued by the CASA delegate under subregulation 39.1 (1) of the Civil Aviation Regulations 1998, with the policy objective being to ensure that the specified actions are taken to mitigate identified safety risks. The AD was subsequently amended to reflect updated compliance intervals and to clarify the applicability of the directive to specific engine models.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39, outlines airworthiness directives which are essential for maintaining the safety standards of aircraft and aeronautical products within Australia. This legislative instrument applies to certain Turbomeca Arriel series turbine engines, specifically the Arriel 1A, 1A1, 1B, 1D, and 1D1 models. The directive mandates specific actions to address unsafe conditions identified with these engines, such as inspecting the reduction gearbox magnetic plug for contamination or replacing the reduction gearbox under certain conditions. The application of this directive is enforced by the Civil Aviation Safety Authority (CASA) and its delegate, ensuring compliance with safety regulations across the Commonwealth. The directive also references relevant foreign airworthiness directives to provide a comprehensive approach to addressing these safety issues. The requirement for compliance is set at intervals not exceeding eight hours of engine time in service or daily, whichever comes first, and before further flight, underscoring the importance of regular maintenance checks. This Airworthiness Directive extends its application nationally, aiming to enhance the safety of civil aviation in Australia by mitigating risks associated with engine failures.
Key Provisions
The Civil Aviation Regulations 1998, under Part 39 - 106, establish Airworthiness Directives (AD) that govern the safety of aircraft and aeronautical products. In particular, AD/ARRIEL/7 Amendment 1, issued by the Civil Aviation Safety Authority (CASA) delegate, pertains to Turbomeca Arriel series turbine engines. Specifically, it mandates actions to rectify an unsafe condition related to the reduction gearbox (module 5) of certain Arriel engines. The directive applies to Arriel 1A, 1A1, 1B, 1D, and 1D1 engines. For Arriel 1B, 1D, and 1D1 engines that do not incorporate modification TU 232, as well as Arriel 1A and 1A1 engines that incorporate modification TU 13 but not modification TU 232, the requirement is to inspect the reduction gearbox's magnetic plug for contamination, following the instructions detailed in Maintenance Manual chapter 72-80-01, pages 104 and 105. For Arriel 1A, 1A1 engines that incorporate modification TU 13 but do not incorporate modification TU 39, and Arriel 1B engines that do not incorporate modification TU 39, the directive mandates the replacement of the reduction gearbox.
The AD imposes obligations on the operators and maintainers of the specified Arriel engines to conduct the required inspections or replacements as outlined. Compliance with these directives is critical to ensuring the continued airworthiness of the aircraft. The directive stipulates that inspections for contamination must be performed at intervals not exceeding eight hours of engine time in service or daily, whichever comes first, and prior to further flight. This ensures that the safety issue is addressed promptly and does not compromise the operational readiness of the aircraft.
Failure to comply with the Airworthiness Directive can result in significant consequences. Non-compliance may lead to the grounding of aircraft until the required actions are taken, potentially resulting in flight delays and financial losses for operators. Additionally, the AD serves as a legal mandate, and any breaches may be subject to enforcement actions by CASA. While the specific penalties are not detailed in the AD itself, non-compliance with Civil Aviation Regulations can lead to administrative penalties, including fines, and may result in criminal charges if the breach leads to safety incidents. The severity of the penalties reflects the importance of adhering to the AD to maintain the high safety standards required in civil aviation.