Commonwealth legislation

AD/TFE731/26 Amdt 1 - Low Pressure Turbine First and Second Stage Disc Suspect Material Properties

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

6/10 complexity

Requires owners/operators of AlliedSignal TFE731‑3 series engines to replace specific first‑ and second‑stage low‑pressure turbine discs listed by serial number in AlliedSignal Alert Service Bulletin No. TFE731‑A72‑3557 (Requirement). CASA’s Delegate made the amendment effective 22 January 2010 and mandates replacement within 100 hours time‑in‑service (Compliance). The discs are suspected of a material micro‑structure that gives unacceptable crack‑growth properties, creating an in‑flight shutdown and disc containment risk (Background). Operators bear replacement and downtime costs.

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Current sections

Direct links to the current provisions in AD/TFE731/26 Amdt 1 - Low Pressure Turbine First and Second Stage Disc Suspect Material Properties.

AlliedSignal (Garrett/AiResearch) Turbin

AlliedSignal (Garrett/AiResearch) Turbine Engines - TFE731 Series

AD/TFE731/26 Amdt 1	Low Pressure Turbine First and SecondStage Disc Suspect Material Properties	1/2010

Applicability:	AlliedSignal TFE731-3 series engines as detailed in AlliedSignal Alert Service Bulletin (ASB) 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 (ASB) No. TFE731-A72-3557.Note: FAA AD 95-07-02 refers.
Compliance:	Unless already accomplished in accordance with the previous issue of this Directive, within 100 hours time-in-service (TIS) after the effective date of this Directive.
	This Amendment becomes effective on 22 January 2010.
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.This amendment references the applicable State of design Directive which is also applicable to AD/TFE731/24 Amdt 1. For information, AD/TFE731/34 is also applicable to first and second stage low pressure turbine discs, but unrelated to this Directive.

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Mike Higgins
Delegate of the Civil Aviation Safety Authority

4 January 2010

AD/TFE731/26 Amdt 1

Low Pressure Turbine First and SecondSta

Low Pressure Turbine First and SecondStage Disc Suspect Material Properties

[Low Pressure Turbine First and Second

Stage Disc Suspect Material Properties](http://casa.gov.au/ADfiles/turbine/tfe731/TFE731-026.pdf)

1/2010

Source text

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

AlliedSignal (Garrett/AiResearch) Turbin AlliedSignal (Garrett/AiResearch) Turbine Engines - TFE731 Series

AlliedSignal (Garrett/AiResearch) Turbine Engines - TFE731 Series

AD/TFE731/26 Amdt 1	Low Pressure Turbine First and SecondStage Disc Suspect Material Properties	1/2010

Applicability:	AlliedSignal TFE731-3 series engines as detailed in AlliedSignal Alert Service Bulletin (ASB) 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 (ASB) No. TFE731-A72-3557.Note: FAA AD 95-07-02 refers.
Compliance:	Unless already accomplished in accordance with the previous issue of this Directive, within 100 hours time-in-service (TIS) after the effective date of this Directive.
	This Amendment becomes effective on 22 January 2010.
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.This amendment references the applicable State of design Directive which is also applicable to AD/TFE731/24 Amdt 1. For information, AD/TFE731/34 is also applicable to first and second stage low pressure turbine discs, but unrelated to this Directive.

Mike Higgins
Delegate of the Civil Aviation Safety Authority

4 January 2010

AD/TFE731/26 Amdt 1 AD/TFE731/26 Amdt 1