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