Commonwealth legislation

AD/APU/10 - GTCP 85 Series APU Axial Containment

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

Requires operators of AlliedSignal GTCP85 Series APUs with a one‑piece cast turbine rotor (excluding installations on Boeing 737 and BAC 1‑11) to install an exhaust centrebody following AlliedSignal service bulletins, to reduce the risk of turbine fragments exiting axially. Flight‑capable APUs must be modified by 30 June 1997 and ground‑only units by 30 June 1998 (Requirement; Compliance). Operators fund and schedule the modification work and the regulator enforces the deadlines.

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Current sections

Direct links to the current provisions in AD/APU/10 - GTCP 85 Series APU Axial Containment.

AD/APU/10 - GTCP 85 Series APU Axial Containment

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Auxiliary Power Units

AD/APU/10 GTCP 85 Series APU Axial Containment 8/95

Applicability: AlliedSignal Aerospace GTCP85 Series Auxiliary Power Units (APU's) incorporating a one piece cast turbine rotor, except those APU's installed on Boeing 737 and British Aerospace BAC 1-11 series aircraft.

Requirement: Install an exhaust centrebody in accordance with AlliedSignal Aerospace Alert Service Bulletin GTCP85-49-A6831 or AlliedSignal Aerospace Service Bulletin GTCP85-49-6919 as applicable.

Note: FAA AD 95-07-03 also refers.

Compliance: (a) Flight operable APU's are to be modified no later than 30 June 1997.

(b) APU's that are ground operable only are to be modified no later than 30 June 1998.

Background: There have been at least two uncontained failures where turbine wheel fragments have exited the APU exhaust axially and damaged the aircraft.

B737 and BAC 1-11 aircraft are exempt from this requirement because the APU exhaust configuration on these aircraft is such that aircraft damage is highly improbable in the event of an uncontained turbine wheel failure which liberates fragments axially.

Source text

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

1 AD/APU/10 - GTCP 85 Series APU Axial Containment