Commonwealth legislation

AD/TPE 331/53 - Third Stage Replacement

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of listed AlliedSignal TPE331 engines that contain third-stage turbine stator P/N 868379-3 (and that were not inspected under NF‑A72‑10961) to replace that stator following AlliedSignal Service Bulletin TPE331‑A72‑0861 Revision 2. The Civil Aviation Safety Authority enforces the requirement. The stated safety purpose is to prevent fatigue cracking that could let the stator move aft and contact the third-stage turbine wheel. Aircraft operators pay for replacements and must follow the specified service bulletin timing and procedures.

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AD/TPE 331/53 - Third Stage Replacement

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 - TPE 331 Series

AD/TPE 331/53 Third Stage Replacement 6/98

Applicability: TPE331-1, -2, -2UA, -3U, -3UW, -3U, -5, -5A, -5AB, -5B, -6, -6A engines

incorporating a part number (P/N) 868379-3 third stage turbine stator not inspected in accordance with National Flight Services Alert Service Bulletin (ASB) Number NF- A72-10961.

Requirement: Replace applicable third stage turbine stator P/N 868379-3 in accordance with AlliedSignal Service Bulletin TPE331-A72-0861 Revision 2.

Note 1: FAA Airworthiness Directive 98-04-15 refers.

Note 2: The requirements of this directive do not supersede the in-service inspection requirements of Airworthiness Directive AD/TPE331/41 Amdt. 2.

Compliance: As detailed in the requirement document.

This Airworthiness Directive becomes effective on 21 May 1998.

Background: This directive has been issued to require the replacement of certain third stage turbine stators. The requirement reflects advice of fatigue cracking may result in the stator moving aft and contacting the third stage turbine wheel. If uncorrected, this could result in uncontained failure of the third stage turbine wheel.

Source text

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

1 AD/TPE 331/53 - Third Stage Replacement