Commonwealth legislation

AD/TFE 731/14 - First Stage L.P. Turbine Disc

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This AD mandates removal and replacement of certain first-stage low-pressure turbine discs on AlliedSignal TFE731-5 engines whose serial numbers are listed in the directive, citing an in‑flight shutdown linked to a suspect forging lot. It affects operators/owners and maintenance organisations, and requires compliance with the referenced G.T.E.C. Alert Service Bulletin on the timelines for removal or replacement.

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Direct links to the current provisions in AD/TFE 731/14 - First Stage L.P. Turbine Disc.

AD/TFE 731/14 - First Stage L.P. Turbine Disc

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/TFE731/14 First Stage L.P. Turbine Disc 9/88 TX

Applicability: TFE 731-5 series engine with suspect first stage L.P. turbine disc whose serial numbers are identified in the Requirement document.

Requirement: Remove from service affected first stage L.P. turbine discs in accordance with

G.T.E.C. Alert SB TFE 731-A72-3371.

Compliance: For discs with less than 750 operating cycles: Prior to exceeding 750 operating cycles.

For discs with more than 750 operating cycles: Replace within 25 operating cycles after 27 June 1988.

Background: This Directive is issued to reflect GTEC Alert SB TFE 731-A72-3371 which advises the recent in-flight shutdown caused by separation of 2 adjacent firtree posts and release of three turbine blades. Engineering investigation determined that discs had been manufactured from a suspect forging lot.

Source text

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

1 AD/TFE 731/14 - First Stage L.P. Turbine Disc