Camshaft gear failures generate airworthiness concern sheet

The airworthiness concern sheet refers to camshaft gears with part numbers 655516 and 656031. It notes that there have been three occurrences of Continental Motors Inc. camshaft gear 656031 with failed gear teeth due to fatigue, a condition that can result in loss of engine power in flight and a forced landing. Continental Motors Inc. has only seen failures involving the gear with part number 655516, it said.

Camshaft gear part number 655516 was manufactured from 1999 to 2002, and was superseded by part number 656031 from 2002 to 2005. In 2009, Continental Motors Inc. introduced part number 656818 via Service Bulletin SB05-8A, superseding part number 656031.

At this time, the FAA has not determined what type of corrective action should be taken, if any.  The resolution of this airworthiness concern could involve airworthiness directive or a special airworthiness information bulletin, or the FAA could determine that no action is needed at this time. Members with information relating to this airworthiness concern sheet are encouraged to contact AOPA.