COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ARRIEL/6 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.
Turbomeca Turbine Engines - Arriel Series
AD/ARRIEL/6
Amdt 1
Erosive Atmosphere Maintenance 11/2001
Applicability: All Arriel 1 series engines operated in an erosive environment as detailed in Turbomeca Alert Service Bulletin No. A292 72 0230 Update No.1 or subsequent revisions.
Note 1: Engines not operated in an erosive environment continue to be subject to inspection of the axial compressor for erosion at intervals as detailed in Chapter 05- 10-02 of the Maintenance Manual.
Requirement: Carry an inspection of the axial compressor 02 module for evidence of erosion and as applicable, clean the gas generator 03 module rotating assembly in accordance with the procedure detailed in Turbomeca Alert Service Bulletin No. A292 72 0230 Update No.1 or subsequent revisions.
Note 2: DGAC AD 1990-064(A) R1 refers.
Compliance: Initial and repetitive inspections; as detailed in the requirement document, with the effective date amended to 1 November 2001.
This Airworthiness Directive becomes effective on 1 November 2001.
Background: This Directive has been issued to address the operation of the Arriel engine in a dusty environment. In addition to erosion of the axial compressor, dust ingestion may result in an accumulation of mineral deposits inside the gas generator shaft. The deposits may cause a rotor out of balance and subsequent failure of the 03 module rear bearing. This amendment varies the requirement document and compliance times.
The original issue of this Directive became effective on 4 October 1990.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 14 September 2001
The above AD is notified in the Commonwealth of Australia Gazette on 10 October 2001.
Page 1 of 1
Overview
The Civil Aviation Safety Regulations 1998, enacted by the Commonwealth of Australia, serve to ensure the safety and airworthiness of aircraft and aeronautical products within Australia. One particular legislative instrument under this regulation is the Airworthiness Directive AD/ARRIEL/6 Amendment 1, issued in 2001 by the Civil Aviation Safety Authority (CASA). This directive was introduced to address the specific issue of erosive atmosphere maintenance for Arriel 1 series engines operated in dusty or erosive environments. The problem identified was the potential for dust ingestion leading to erosion of the axial compressor and the accumulation of mineral deposits inside the gas generator shaft, which could result in rotor imbalance and rear bearing failure. The policy objective of this directive is to mandate regular inspections and maintenance procedures to mitigate these risks and ensure continued safe operation of the affected engines.
Scope and Application
The Civil Aviation Safety Regulations 1998, specifically Airworthiness Directive AD/ARRIEL/6 Amendment 1, applies to all Arriel 1 series engines that are operated in an erosive environment as defined by Turbomeca Alert Service Bulletin No. A292 72 0230 Update No.1 or subsequent revisions. This legislation targets the maintenance and inspection of these particular turbine engines used in aircraft, ensuring they remain airworthy and safe for operation. The directive is a regulatory measure issued under the authority of the Civil Aviation Safety Regulations 1998, which mandates inspections of the axial compressor 02 module for signs of erosion and requires cleaning of the gas generator 03 module rotating assembly as detailed in the specified bulletin. The directive applies to all relevant engines irrespective of the operator or entity, provided they are utilised in the conditions specified. The requirement to comply with the directive is national in scope, affecting the entire civil aviation industry within Australia. Notably, engines not operated in erosive environments are still subject to inspections at intervals specified in the Maintenance Manual. The application of this directive is managed by the Civil Aviation Safety Authority, which has the power to revoke or amend such directives as necessary to ensure ongoing safety standards.
Key Provisions
The Civil Aviation Safety Regulations 1998, specifically under subregulation 39.1(1) of CAR 1998, mandate that the Civil Aviation Safety Authority (CASA) delegate can revoke an existing Airworthiness Directive (AD) and issue a new one if necessary to address unsafe conditions. In this instance, AD/ARRIEL/6 has been revoked and replaced with a new directive concerning the Arriel 1 series engines (section 106). The new directive focuses on engines operating in erosive environments, as outlined in Turbomeca Alert Service Bulletin No. A292 72 0230 Update No.1 or subsequent revisions. The requirement is to conduct inspections of the axial compressor 02 module for erosion and, as needed, clean the gas generator 03 module rotating assembly according to the specified procedure. The compliance section notes that inspections must be carried out at the intervals detailed in the requirement document, with the effective date updated to 1 November 2001.
Operators of Arriel 1 series engines must comply with the new AD by performing the specified inspections and maintenance actions as detailed. This includes conducting an initial inspection and subsequent repetitive inspections as outlined in the requirement document. These inspections are critical to ensure the airworthiness of the engines, particularly in environments prone to dust and erosion, which can lead to serious mechanical failures if not properly managed. Failure to comply with these requirements may result in the engine being deemed non-airworthy, potentially grounding the aircraft and leading to significant safety risks.
The AD also highlights potential consequences for non-compliance, which could include serious safety risks and possible legal repercussions. Specifically, if operators do not adhere to the AD's requirements, they could face regulatory action from CASA. In severe cases, this could result in penalties under the Civil Aviation Act 1988, which includes fines and other enforcement actions. The exact penalties depend on the severity of the breach and any resulting safety risks, but they can be significant, reflecting the importance of maintaining airworthiness standards. Ensuring compliance with the AD is, therefore, not only a legal obligation but also a critical safety measure.