AD/CON/63 Amdt 2 - Connecting Rods

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On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/CON/63 Amdt 1 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Teledyne Continental Motors Piston Engines
AD/CON/63 Amdt 2
Connecting Rods
This AD applies to all models of Teledyne Continental Motors engines.

To prevent the possible failure of a connecting rod bolt; during assembly of all connecting rod bolts and nuts, the nuts are to be torqued in accordance with the torque limits detailed in Teledyne Continental Motors (TCM) Service Bulletin SB96-7C (TCM SB96-7C).
Note 1:  Where there is a conflict between the torque limits detailed in SB96-7C and the applicable TCM engine model overhaul manual, this directive designates TCM SB96‑7C has priority over the applicable engine model overhaul manual, CAR 50E refers.
Note 2:  Later revisions to TCM SB96-7C, dated 8 February 2005, approved by the United States Federal Aviation Administration (FAA), are considered acceptable for compliance with the equivalent Requirements of this AD.

At each assembly of a connecting rod to a crankshaft.

The effective date of this AD is 21 November 2013.

This directive was originally issued to require compliance with the manufacturer’s 1992 revision to connecting rod assembly torque limits.  The requirement reflected the results of a 1991 CASA investigation of a fatal C210 accident.  The engine failure in that accident was attributed, in part, to marginal connecting rod bolt torque limits detailed in the engine overhaul manual.  The manufacturer’s election to revise the torque limits were then detailed in SB M92-15, not an amendment to the applicable overhaul manual.

This AD, AD/CON/63 Amdt 2, notates the acceptability of later revisions to TCM SB96-7C, approved by the FAA and makes minor editorial corrections throughout the text.  There is no technical change to the requirements and no change to the compliance from the previous amendment.  Compliance with the previous amendment of this AD constitutes compliance with this amendment.
AD/CON/63 Amdt 1, which became effective on 4 November 1999, reflected the manufacturer’s latest revision to torque limits.  The torque limits detailed in the requirement document continued to conflict with torque limits detailed in certain overhaul manuals.  Therefore, the directive continued to mandate the revised limits.

The original issue of this Airworthiness Directive became effective on
10 December 1992.

Mike Higgins
Delegate of the Civil Aviation Safety Authority
6 November 2013