Commonwealth legislation

AD/OM-P/4 - Piston Pin Circlip - Replacement and Installation Procedure

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This instrument requires owners, operators and maintenance organisations of Walter M4‑111, M6‑111, M332 and M337 piston engines to treat piston‑pin circlips as single‑use: any removed circlip must be replaced. It also mandates dimensional checks and removal/installation procedures set out in named Omnipol service bulletins and use of a circlip driver of the specified principle. Practical effects: recurring parts, labour and tooling costs and standardized installation to protect circlip integrity.

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AD/OM-P/4 - Piston Pin Circlip - Replacement and Installation Procedure

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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 Omnipol Piston Engines

AD/OM-P/4 Piston Pin Circlip - Replacement NK

and Installation Procedure

Applicability: Walter M4-111, M6-111, M332 and M337 engines.

Requirement: 1. Piston pin circlips may be used only once, and shall be replaced with a new circlip after each removal from the piston groove, irrespective of the length of the time in service.

The dimensional checks of new circlips and procedures for removal, gap positioning and installation of circlips specified in Omnipol SBs Nos. M4-111/29, M6-111/27, M332/55 and M337/50 shall be observed, using a circlip driver similar in principle to driver P/N Z 2-01503-01.

Compliance: At each removal of circlip after 30 September 1974.

Source text

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