Commonwealth legislation

AD/AL 250/2 - Compressor Front Bearing Thrust Washer and Spring - Replacement

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This is a safety maintenance order for specific aircraft engines.

Who it affects: Owners and operators of aircraft fitted with Allison 250-C18 or 250-C18A turbine engines.

What it requires: If you overhaul one of these engines after 13 June 1968, you must replace the compressor front bearing thrust washer and spring before installing the engine back into an aircraft. The replacement must follow the manufacturer's instructions in Allison Service Bulletin 250 CEB-6.

Why it matters: Worn or faulty thrust washers can cause engine compressor failure. This rule prevents potentially catastrophic engine damage by ensuring critical parts are replaced during overhaul.

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AD/AL 250/2 - Compressor Front Bearing Thrust Washer and Spring - 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 250/2 Compressor Front Bearing Thrust Washer and Spring - Replacement

6/68

Applicability: All 250-C18 and 250-C18A engines compressors specified in Allison CEB No. 250 CEB-6.

Document: Allison CEB No. 250 CEB-6.

Compliance: Before installation in an aircraft following next overhaul completed after 13 June 1968.

Source text

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