Commonwealth legislation

AD/TFE 731/26 - Low Pressure Turbine First and Second Stage Disc Suspect Material Properties

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This Act has been repealed and is no longer in force. It is retained for historical reference.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 is a mandatory safety directive (called an Airworthiness Directive) that orders aircraft operators to replace specific engine parts on certain jet engines.

Who it affects: Owners and operators of AlliedSignal TFE731-3 series turbine engines (commonly used in business jets).

What must be done: If your engine contains specific first or second stage low-pressure turbine discs (identified by serial numbers listed in AlliedSignal Alert Service Bulletin TFE731-A72-3557), you must replace those discs.

Why it matters: Some turbine discs were manufactured with defective material that could develop cracks too easily. This creates two serious safety risks: the engine could shut down during flight, or a disc could break apart and puncture the engine casing (a 'disc containment' failure), potentially damaging the aircraft or injuring passengers.

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Current sections

Direct links to the current provisions in AD/TFE 731/26 - Low Pressure Turbine First and Second Stage Disc Suspect Material Properties.

AD/TFE 731/26 - Low Pressure Turbine First and Second Stage Disc Suspect Material Properties

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AlliedSignal (Garrett/AiResearch) Turbine Engines - TFE731 Series

AD/TFE731/26 Low Pressure Turbine First and Second

Stage Disc Suspect Material Properties

3/95

Applicability: AlliedSignal TFE731-3 series engines as detailed in AlliedSignal Alert Service Bulletin No. TFE731-A72-3557.

Requirement: Replace certain first and second stage low pressure turbine discs as listed by serial number in AlliedSignal Alert Service Bulletin No. TFE731-A72-3557.

Compliance: Effective 2 March 1995: As detailed in the Requirement Document.

Background: This Directive has been issued to require the removal from service of certain turbine discs suspected of having a material micro-structure with unacceptable crack growth properties. This is both an engine in-flight shutdown and a disc containment concern.

Source text

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

1 AD/TFE 731/26 - Low Pressure Turbine First and Second Stage Disc Suspect Material Properties