Commonwealth legislation

AD/CON/61 - Crankshaft Removal/Inspection

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legislative instrument

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This Airworthiness Directive requires removal and dimensional inspection of crankshaft bearing journals on Teledyne Continental piston engines overhauled or whose crankshafts were disassembled by Arnhem Aircraft Engineering (Cert No 4049) between 1 Jan 1990 and 6 Aug 1992; journals below the STANDARD dimension must be quarantined and reported to the local CAA, and journals at STANDARD may be refitted. The rule imposes inspection, removal and possible replacement costs on aircraft owners/operators and maintenance organisations and mandates CAA notification because grinding cracks were found and Arnhem could not identify which crankshafts were ground.

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AD/CON/61 - Crankshaft Removal/Inspection

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/61 Crankshaft Removal/Inspection 10/92 DM

Applicability: All Teledyne Continental piston engines that have been overhauled by or had the crankshaft disassembled for major work by Arnhem Aircraft Engineering Pty Ltd under Certificate of Approval No 4049 during the period 1 January 1990 to 6 August 1992.

Requirement: 1. Remove the crankshaft assembly and dimensionally check the diameters of all bearing journals.

2. Crankshafts with any bearing journal diameter less than the STANDARD dimension listed in the relevant Teledyne Continental Engine Overhaul Manual are to be quarantined and the local CAA Airworthiness District Office notified.

3. Crankshafts with diameters for all bearing journals at the STANDARD dimension listed in the relevant Teledyne Continental Engine Overhaul Manual may be refitted to an engine.

Compliance: For installed engines - Prior to the 31 August 1992.

For uninstalled engines - Before installation into an aircraft.

Background: Four crankshaft assemblies repaired by the grinding of bearing journals on behalf of Arnhem Aircraft Engineering Pty Ltd have been found with grinding cracks, two of which failed in flight. Arnhem Aircraft Engineering Pty Ltd has been unable to satisfy the CAA (Aust) as to the location or number of crankshafts repaired by grinding on its behalf.

Source text

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

1 AD/CON/61 - Crankshaft Removal/Inspection