COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ARRIEL/18 and issues the following AD under subregulation 39.1 (1) of CASR 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.
Turbomeca Turbine Engines - Arriel Series
AD/ARRIEL/18
Amdt 1
2nd Stage Nozzle Guide Vanes 11/2004 DM
Applicability: TURBOMECA ARRIEL 1B, 1D and 1D1 model engines incorporating MOD TU 202, except those engines having 2nd stage nozzle guide vanes which are detailed in TURBOMECA Service Bulletin (SB) No. 292 72 0231 Revision 5.
Requirement: Action in accordance with paragraph 2.B, operating instructions, of TURBOMECA SB No. 292 72 0231 Revision 5, dated 22 July 2004.
Note: DGAC AD F-2004-088R1 (EASA reference No 2004-8068) refers.
Compliance: Unless previously accomplished in accordance with earlier revisions of TURBOMECA SB 292 72 0231, during the next deep maintenance, or at the next occasion the engine is sent to a repair centre or at the latest before 31 December 2006, whichever occurs first.
This Amendment becomes effective on 30 September 2004.
Background: This Directive is issued to detect and prevent a possible perforation of the 2nd stage nozzle guide vanes (NGV) and the formation of an aerodynamic wake upstream of the 2nd stage NGV. Such a wake may lead to the rupture of a 2nd stage turbine blade followed by an uncommanded engine shutdown.
This amendment clarifies the applicability of the engines affected. The requirements detailed now only apply to those engines fitted to single engine helicopters.
The original issue of this Directive becomes effective on 30 September 2004.
James Coyne
Delegate of the Civil Aviation Safety Authority 14 September 2004
The above AD is notified in the Commonwealth of Australia Gazette on 22 September 2004.
Overview
The Civil Aviation Safety Regulations 1998, as amended by this legislative instrument, aim to enhance the safety standards of civil aviation within Australia. Enacted by the Parliament of the Commonwealth of Australia, this regulation focuses on ensuring that aircraft and aeronautical products meet stringent safety criteria. The policy objective behind these regulations is to mitigate risks associated with civil aviation operations, thereby safeguarding public safety and maintaining high standards of airworthiness. Specifically, this legislative instrument addresses the safety concerns related to the Turbomeca Arriel series engines, requiring corrective actions to prevent potential engine failures stemming from issues with the 2nd stage nozzle guide vanes. This amendment to the Airworthiness Directive is a response to identified safety risks, ensuring that necessary precautions are implemented to avoid engine shutdowns and associated hazards.
Scope and Application
The Civil Aviation Safety Regulations 1998, specifically within Part 39 - 106, address safety concerns related to airworthiness directives (AD) and the actions required to mitigate risks associated with particular aircraft or aeronautical products. This legislative instrument is applicable to specific Turbomeca Arriel 1B, 1D, and 1D1 model engines, excluding those detailed in Turbomeca Service Bulletin No. 292 72 0231 Revision 5. The AD mandates specific actions to be undertaken in response to identified safety issues, particularly the potential for perforation of the 2nd stage nozzle guide vanes, which could result in turbine blade rupture and uncommanded engine shutdown. This directive is enforced by the Civil Aviation Safety Authority (CASA) and applies to engines fitted to single engine helicopters. Compliance with this AD must be achieved during the next deep maintenance, at the next repair centre visit, or before 31 December 2006, whichever is earliest. The regulations extend nationally across Australia, applying uniformly in all states and territories, and are enforced by the CASA delegate.
Key Provisions
The main operative sections of this Airworthiness Directive (AD) include the applicability, requirement, and compliance sections. Section 11 specifies the applicability of the AD to certain Turbomeca Arriel 1B, 1D, and 1D1 model engines, excluding those with specific nozzle guide vanes as detailed in Turbomeca Service Bulletin No. 292 72 0231 Revision 5. Section 12 outlines the requirement for action in accordance with the specified paragraph of the Turbomeca Service Bulletin, dated 22 July 2004. The compliance section (section 13) mandates that the required action be taken during the next deep maintenance, or when the engine is sent to a repair centre, or at the latest by 31 December 2006, whichever comes first.
The obligations imposed by this AD require operators of the specified Turbomeca Arriel engines to ensure that the action detailed in the requirement section is taken in accordance with the instructions set out in Turbomeca Service Bulletin No. 292 72 0231 Revision 5. This action is necessary to address the potential risk of a possible perforation of the 2nd stage nozzle guide vanes, which may lead to an uncommanded engine shutdown. The AD aims to enhance the safety of these engines by preventing the formation of an aerodynamic wake upstream of the 2nd stage nozzle guide vanes.
Any failure to comply with this Airworthiness Directive could result in significant safety risks, potentially leading to uncommanded engine shutdowns and subsequent accidents. Although the specific civil or criminal consequences for non-compliance are not detailed within the text, the AD is issued under subregulation 39.1 (1) of the Civil Aviation Safety Regulations 1998. Non-compliance with ADs may result in enforcement action by the Civil Aviation Safety Authority, which could include fines, legal proceedings, or other penalties as prescribed by the regulations. The maximum penalties for such breaches are determined by the applicable laws and regulations governing civil aviation safety in Australia.