Commonwealth legislation

AD/AL 250/37 - Third Stage Turbine Wheel - Replacement

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This AD mandates removal and replacement of third‑stage turbine wheels (P/N 6898553 or 6898773) on Allison 250‑C28 series engines, with short, hour‑based deadlines (replace soon if already >300 hours; before 325 hours if not). It affects owners/operators and maintenance suppliers, imposes direct parts/labour and downtime costs on operators, and implements an FAA emergency safety action to reduce the risk linked to those specific wheels.

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Direct links to the current provisions in AD/AL 250/37 - Third Stage Turbine Wheel - Replacement.

AD/AL 250/37 - Third Stage Turbine Wheel - 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 250/37 Third Stage Turbine Wheel - Replacement 9/79

Applicability: All 250-C28 series engines fitted with third stage turbine wheel P/No. 6898553 or 6898773.

Requirement: Remove affected Part Number Turbines from service.

Note: FAA Emergency AD Dated 19 July 1979 refers.

Compliance: 1. For turbines with more than 300 hours’ time in service - Within 25 hours’ time in service from 9 August 1979.

2. For turbines with less than 300 hours’ time in service - Before reaching 325 hours’ time in service.

Source text

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