Commonwealth legislation

AD/TPE 331/11 - High Speed Pinion Bearing Assembly - 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This Act has been repealed and is no longer in force. It is retained for historical reference.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

3/10 complexity

What this does: This Airworthiness Directive (AD) is a mandatory safety order requiring the replacement of the high-speed pinion bearing assembly in specific AlliedSignal (Garrett/AiResearch) TPE 331 aircraft turbine engines.

Who it affects: Aircraft operators using TPE-331 engines, specifically models: -25AA, -25DA, -25FA, -43A, -47A, -55A, -57A, -61A, -43BL, -25AB, -47B, -25DB, -25FB, -55B, -71, -57B, -61B, and -49.

What you must do: Before installing one of these engines in an aircraft following its next major reconditioning (significant overhaul) completed after 31 May 1972, you must replace the high-speed pinion bearing assembly.

Why it matters: This prevents catastrophic engine failures caused by bearing defects. The directive references technical guidelines in AiResearch Service Bulletin No. 659 to ensure proper replacement procedures are followed.

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AD/TPE 331/11 - High Speed Pinion Bearing Assembly - 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 AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series

AD/TPE 331/11 High Speed Pinion Bearing Assembly - Replacement

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Applicability: TPE-331-25AA, 25DA, 25FA, 43A, 47A, 55A, 57A, 61A, 43BL, 25AB, 47B, 25DB, 25FB, 55B, 71, 57B, 61B and 49.

Document: AiResearch TPE-331 SB No. 659, Rev. 3, or AD/AIR-T/12.

Compliance: Before installation in an aircraft following next major reconditioning completed after 31 May 1972.

Source text

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