COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Turbomeca Turbine Engines - Arriel Series
AD/ARRIEL/12 Power Turbine Nozzle Inspection 5/99
Applicability: Arriel 1A, 1A1, 1A2 and 1B models not incorporating Turbomeca Modification TU 38.
Requirement: To detect cracking of the power turbine nozzle vanes which may result in an in flight shutdown of the engine, carry out an ultrasonic inspection of the internal face of the gas generator module rear bearing support in accordance with the procedure detailed in Turbomeca Service Bulletin No. 292 72 0213.
Note: DGAC Airworthiness Directive 98-493 (A) refers.
Compliance: At next engine shop visit, regardless of the purpose of the visit, or prior to 30 June 1999, whichever occurs first.
This Airworthiness Directive becomes effective on 20 May 1999.
Background: This directive has been issued to require a once only inspection of the gas generator rear bearing support. The requirement follows advice from the manufacturer of cracks developing in the bearing support.
Overview
The Civil Aviation Regulations 1998, amended through Legislative Instrument F2006B02444, specifically within Part 39, addresses issues related to the airworthiness of turbomeca turbine engines in the Arriel series. This legislative instrument was introduced to address the problem of potential cracking in the power turbine nozzle vanes of Arriel 1A, 1A1, 1A2, and 1B models, which could lead to an in-flight shutdown of the engine. The directive mandates an ultrasonic inspection of the internal face of the gas generator rear bearing support to detect such cracks, as detailed in Turbomeca Service Bulletin No. 292 72 0213, and aligns with DGAC Airworthiness Directive 98-493 (A). The objective of this directive, as set forth by the Civil Aviation Safety Authority, is to ensure the safety and reliability of the specified turbomeca turbine engines in operation.
This legislative instrument was enacted by the Commonwealth of Australia, specifically through the Civil Aviation Safety Authority, to ensure compliance with international safety standards and to mitigate risks associated with engine failures. The directive became effective on 20 May 1999, requiring compliance at the next engine shop visit or by 30 June 1999, whichever is earlier. The directive responds to manufacturer reports of cracks in the bearing supports and aims to prevent potential in-flight engine shutdowns due to such issues.
Scope and Application
The Civil Aviation Regulations 1998, particularly Part 39, governs various safety standards and procedures for aviation activities within Australia. Specifically, the Airworthiness Directives within this part establish the standards and requirements for ensuring the safety and airworthiness of aircraft and their components. AD/ARRIEL/12 applies to Turbomeca Arriel Series engines, specifically the Arriel 1A, 1A1, 1A2, and 1B models that do not incorporate Turbomeca Modification TU 38. The directive mandates an ultrasonic inspection of the internal face of the gas generator module rear bearing support to detect potential cracking of the power turbine nozzle vanes. This inspection is crucial to prevent in-flight shutdown of the engine, and must be conducted in accordance with the procedure detailed in Turbomeca Service Bulletin No. 292 72 0213. The requirement to comply with this directive is at the next engine shop visit, or before 30 June 1999, whichever comes first, following its effective date of 20 May 1999. This directive ensures that the specified engines maintain their airworthiness and safety standards, as per the regulatory requirements set by the Civil Aviation Safety Authority.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 106, addresses the maintenance and safety directives related to aircraft components. Under this legislation, Section AD/ARRIEL/12 pertains to the inspection of Turbomeca Arriel series engines, particularly models 1A, 1A1, 1A2, and 1B that do not include Turbomeca Modification TU 38. The key requirement here is an ultrasonic inspection of the internal face of the gas generator module rear bearing support to detect any cracking of the power turbine nozzle vanes, as detailed in Turbomeca Service Bulletin No. 292 72 0213. This inspection is mandated to prevent potential in-flight shutdowns of the engine, as referenced in DGAC Airworthiness Directive 98-493 (A).
The obligations imposed by this directive are straightforward: operators of Arriel series engines must ensure the specified inspection is performed. This inspection must occur at the next scheduled engine shop visit, regardless of the reason for the visit, or before 30 June 1999, whichever comes first. This directive came into effect on 20 May 1999, underscoring the urgency and importance of compliance. Operators are expected to follow the detailed procedures outlined in Turbomeca Service Bulletin No. 292 72 0213 to carry out the required inspection accurately and effectively.
Failure to comply with this Airworthiness Directive can have serious consequences. While the specific civil or criminal penalties are not detailed in the text, breaches of aviation safety regulations can generally result in severe penalties. These may include fines, penalties, and potential grounding of the aircraft until compliance is achieved. Additionally, there could be implications for the operator's license and reputation, along with possible legal actions from affected parties. The overarching intent is to ensure that all safety directives are adhered to rigorously, maintaining the highest standards of airworthiness and flight safety.