Commonwealth legislation

AD/AL 250/18 - Compressor Bleed Valve Orifice - Installation

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

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What this is: A safety directive requiring operators of specific helicopter engines to modify the compressor bleed valve orifice (a small opening that releases air pressure from the engine).

Who it affects: Owners and operators of Hughes 369H helicopters equipped with Allison 250-C18A series turbine engines that have bleed valves with part numbers 6854607 or 6870460.

What you must do: Install or modify the compressor bleed valve orifice according to the manufacturer's instructions in service bulletin Allison 250 CEB 107.

Deadline: This work must be completed before 31 July 1973.

Why it matters: This fixes a potential safety defect in the engine's air pressure regulation system. If not corrected, the bleed valve could malfunction, risking engine damage or failure during flight.

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AD/AL 250/18 - Compressor Bleed Valve Orifice - Installation

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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 250/18 Compressor Bleed Valve Orifice - Installation 7/73

Applicability: All 250-C18A series fitted with bleed valves. P/N 6854607 or 6870460 installed in Hughes 369H Helicopters.

Document: Allison 250 CEB 107.

Compliance: Before 31 July 1973.

Source text

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