Commonwealth legislation

AD/AL 250/3 - Oil Filter By-Pass Valve Poppet Guide - 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This Act has been repealed and is no longer in force. It is retained for historical reference.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 Airworthiness Directive mandates the replacement of a specific mechanical part—the oil filter by-pass valve poppet guide—in certain Allison turbine aircraft engines.

Who it affects Operators and maintenance providers working with Allison 250-C18 or 250-C18A engine gearboxes (specifically those listed in the manufacturer's service bulletin Allison CEB No. 250 CEB-31).

What it requires Before installing one of these engines in an aircraft after its next overhaul, you must replace the poppet guide with a new component according to the specifications in the manufacturer's service bulletin mentioned above.

Why it matters The poppet guide is a critical component of the oil filtration system. Failure to replace it could compromise oil pressure regulation and filtration, potentially leading to engine damage or failure during flight.

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AD/AL 250/3 - Oil Filter By-Pass Valve Poppet Guide - 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 250/3 Oil Filter By-Pass Valve Poppet Guide - Replacement

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Applicability: All 250-C18 and 250-C18A engine gearboxes specified in Allison CEB No. 250 CEB-31.

Document: Allison CEB No. 250 CEB-31.

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.