Commonwealth legislation

AD/CON/67 - Valve Retainer Key

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

Mechanically, this airworthiness directive requires operators of Teledyne Continental Motors engines or TCM‑supplied cylinders manufactured, remanufactured, overhauled or supplied between 29 July 1992 and 30 March 1993 with under 25 hours TIS to have valve retainer key installation verified according to TCM Mandatory Service Bulletin MSB 93‑12. The inspection must be done before further flight and is the responsibility and cost of aircraft owners/operators and maintenance organisations (Applicability; Requirement; Compliance). It follows two overseas engine failures linked to missing keys (Background).

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AD/CON/67 - Valve Retainer Key

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Teledyne Continental Motors Piston Engines

AD/CON/67 Valve Retainer Key 8/93 DM

Applicability: All engines manufactured/remanufactured/overhauled by Teledyne Continental Motors (TCM) in the period July 29 1992 and March 30 1993, as listed by serial number in TCM mandatory service bulletin (MSB) No. 93-12, dated MAY 12 1993, which have less than 25 hours TIS since installation, and all Cylinder assemblies supplied by TCM between JULY 29 1992 and MARCH 30 1993, which have less than 25 hours TIS since installation.

Requirement: Verify proper valve retainer key installation in accordance with TCM Mandatory Service Bulletin No. MSB 93-12.

Note: FAA Airworthiness Directive 93-10-02 refers.

Compliance: Effective June 7 1993; unless previously accomplished, before further flight.

Background: This Directive has been issued to require an inspection of certain TCM engines and cylinders for correct assembly of the valve retainer keys. The requirement follows advice of two overseas events in which missing valve retainer keys resulted in engine failure.

Source text

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

1 AD/CON/67 - Valve Retainer Key