Commonwealth legislation

AD/AL 250/69 - Installation of Internal Energy Absorbing Ring

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

What this is: A mandatory safety instruction (Airworthiness Directive) issued by the Civil Aviation Safety Authority for owners of specific Allison 250 series turbine engines.

What it requires: Installation of an internal "energy absorbing ring" (a protective metal component) inside certain engines that were manufactured without it.

Who it affects: Owners and operators of Allison 250-C28, 250-C28B, or 250-C28C engines that do not already contain part number 23031865.

Why it matters: This safety device acts like a protective cage around the engine's first turbine wheel. If that wheel fails and shatters, the ring catches the high-speed metal fragments to prevent them from shooting through the engine casing and destroying the aircraft body ("airframe"). Without this fix, a single engine component failure could destroy the entire aircraft and kill everyone on board.

How to comply: Follow the technical instructions in the Allison service document referenced as C.E.B.-A-72-2126.

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AD/AL 250/69 - Installation of Internal Energy Absorbing Ring

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Allison Turbine Engines - 250 Series

AD/AL 250/69 Installation of Internal Energy Absorbing Ring 2/86

Applicability: 250-C28, -C28B and -C28C engines which do not incorporate internal energy absorbing ring P/N 23031865.

Requirement: Allison C.E.B.-A-72-2126.

Compliance: In accordance with the Requirement Document.

Background: This Directive is issued to ensure that debris from a no. 1 turbine wheel burst is contained thus precluding the possibility of secondary damage to the airframe.

Source text

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