Commonwealth legislation

AD/AL 250/45 - Power Turbine Inner and Outer Coupling Shaft - Replacement

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

This mandatory Airworthiness Directive from the Civil Aviation Safety Authority requires owners/operators of specified Allison 250-B17B, C20B, C28B and C30 engines (per manufacturer serial lists) to replace the power turbine inner and outer coupling shafts within 100 flight hours after 31 July 1981. The replacement must follow the manufacturer’s service bulletins to prevent in‑flight coupling failure and potential catastrophic engine loss.

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AD/AL 250/45 - Power Turbine Inner and Outer Coupling Shaft - Replacement

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Allison Turbine Engines - 250 Series

AD/AL 250/45 Power Turbine Inner and Outer Coupling Shaft - Replacement

7/81

Applicability: Model 250-B17B, C20B, -C28B and -C30 engines fitted with turbines of S/Nos. specified in the reference document.

Document: 1. Allison 250-C20B CEB-A-1173; or

2. Allison 250-B17B CEB-A-1138; or

3. Allison 250-C28B CEB-A-72-2055; or

4. Allison 250-C30 CEB-A-72-3049.

Compliance: Within 100 hours’ time in service after 31 July 1981.

Background: This Directive is issued to preclude a power turbine coupling failure.

Source text

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