Commonwealth legislation

AD/ALF/9 Amdt 1 - Third Stage Turbine Rotor Assembly

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Commonwealth

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legislative instrument

Plain English Summary

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What this does: This Airworthiness Directive requires certain third-stage turbine rotor assemblies (P/N 2-143-040-16) in AlliedSignal (Lycoming) ALF502 L and R engines to be removed from service if their serial numbers are listed in the cited service bulletins. The action targets rotors with suspected faulty heat treatment that can deform disc tenons and cause blade release (Background).

Who pays and how it works: Aircraft operators must remove and replace affected rotors according to the Compliance schedule in the Requirement Document; maintenance organisations must follow the service-bulletin lists (Applicability/Requirement/Compliance).

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Current sections

Direct links to the current provisions in AD/ALF/9 Amdt 1 - Third Stage Turbine Rotor Assembly.

AD/ALF/9 Amdt 1 - Third Stage Turbine Rotor Assembly

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series

AD/ALF/9

Amdt 1

Third Stage Turbine Rotor Assembly 11/88

Applicability: ALF 502 L and R series with third stage turbine rotor assemblies whose serial numbers are listed in the Requirement Documents.

Requirement: Remove from service those third stage turbine rotor assemblies P/N 2-143-040-16 with serial numbers listed in Lycoming Service Bulletins No. A-ALF 502L-72-0189 Rev 1 and A-ALF 502R-72-0189 Rev 1.

Compliance: In accordance with the schedules laid down in Section D of the relevant Requirement Document.

Background: This Directive is amended to reflect Rev 1 to each of the Requirement documents which updates Appendix 1 lists of affected rotor assemblies. The Directive was issued to remove from service those third stage turbine rotor assemblies which have been identified with suspect heat treatment during manufacture. Suspect rotors may suffer disc tenon deformation with subsequent blade release resulting in engine damage.

Source text

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

1 AD/ALF/9 Amdt 1 - Third Stage Turbine Rotor Assembly