Commonwealth legislation

AD/APU/3 - Incorporation of Back-Up Plate to Improve Turbine Wheel Containment

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

What this does: This Airworthiness Directive requires aircraft operators to install a protective 'back-up plate' on specific models of Garrett auxiliary power units (APUs) — essentially small jet engines used to power aircraft systems on the ground.

Who it affects: Owners and operators of aircraft using Garrett GTCP36-4A, -6, -16, -16A, or -28 model APUs.

What must be done: Install the back-up plate in accordance with Garrett Service Bulletin GTCP36-49-5323R2 before 1 July 1984.

Why it matters: Following several incidents where turbine discs (spinning metal parts inside the engine) broke apart and nearly escaped their housings, this safety fix ensures that if a disc fails, the metal fragments are contained within the engine casing rather than flying out and potentially damaging the aircraft or injuring people.

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AD/APU/3 - Incorporation of Back-Up Plate to Improve Turbine Wheel Containment

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Auxiliary Power Units

AD/APU/3 Incorporation of Back-Up Plate to Improve

Turbine Wheel Containment

Applicability: Garrett Model No. GTCP36-4A, -6, -16, -16A, -28. Document: Garrett SB No. GTCP36-49-5323R2.

Compliance: Prior to July 1st 1984.

1/83

Background: An uncontained turbine disc failure and a near uncontained turbine disc failure have occurred locally over the past two years. This Directive is issued to preclude further uncontained failed discs.

Source text

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