AD 96-12-06 61 FR 29931

This amendment supersedes two existing airworthiness directives (AD's), applicable to Teledyne Continental Motors and Rolls- Royce, plc O-200 series reciprocating engines, that currently require resetting engine timing to 24 deg. Before Top Center (BTC). This amendment returns to the 28 deg. BTC engine timing for those engines equipped with improved cylinders that have strengthened heads. In addition, this amendment drops the TCM O-200C model which never went into production. This amendment is prompted by the availability of improved cylinders. The actions specified by this AD are intended to prevent possible cylinder cracking with subsequent loss of engine power.