Commonwealth legislation

AD/ARRIEL/3 Amdt 2 - Free Turbine Containment Shield

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires operators of specified Turbomeca Arriel 1A/1A1/1B/1D/1D1 helicopter engines to install a free‑turbine containment shield. The installation must follow the Turbomeca service bulletins identified in the directive and is due at the next disassembly of the free‑turbine module. Operators pay for parts and maintenance and must choose the correct service bulletin based on which TU modifications are already fitted. The amendment aligns the requirement with DGAC Airworthiness Directive 95‑069(B).

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AD/ARRIEL/3 Amdt 2 - Free Turbine Containment Shield

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Turbomeca Turbine Engines - Arriel Series

AD/ARRIEL/3

Amdt 2

Free Turbine Containment Shield 7/95

Applicability: Arriel 1A, 1A1, 1B, 1D, 1D1 engines.

Requirement: Install a free turbine containment shield in accordance with the following requirements:

Arriel 1A and 1A1 engines incorporating modification TU 13 but not incorporating modifications TU 99 and TU 215, action in accordance with Turbomeca Service Bulletins 292-72-0206 (TU 254) and 292-72-0208 (TU 259).

2. Arriel 1B and 1D engines not incorporating modifications TU 99 and TU 215, action in accordance with Turbomeca Service Bulletins 292-72-0206 (TU 254) and 292-72-0208 (TU 259).

3. Arriel 1A and 1A1 engines incorporating modifications TU 13 and TU 99, action in accordance with Turbomeca Service Bulletins 292-72-0207 (TU 255) and 292- 72-0208 (TU 259).

4. Arriel 1B, 1D and 1D1 engines incorporating modification TU 99, action in accordance with Turbomeca Service Bulletins 292-72-0207 (TU 255) and 292-72- 0208 (TU 259).

Note: DGAC Airworthiness Directive 95-069(B) refers.

Compliance: Effective 22 June 1995; at next disassembly of the free turbine module assembly.

Background: This Directive has been issued to require the installation of a containment shield to the free turbine module. The requirement is to prevent the release of turbine components in the event of an overspeed failure of the free turbine. This amendment reflects the requirements of DGAC Airworthiness Directive 95-069(B).

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/ARRIEL/3 Amdt 2 - Free Turbine Containment Shield