Engine Failure Due to Worn Magneto Cam Follower Leads to Forced Landing (N34080)

What happened

The pilot was operating the aircraft in cruise flight when an unexpected engine failure occurred. In response to the loss of power, the pilot immediately declared an emergency and initiated procedures for a forced landing. During the landing roll, the airplane collided with a ditch, resulting in damage to the airframe.

The investigation

A subsequent examination of the aircraft's engine revealed that the magneto cam follower was both worn and burned. This condition prevented the ignition points from opening properly, which disrupted the spark necessary for engine operation. Further review indicated that a service bulletin requiring inspection of the cam follower had not been accomplished prior to the incident.

Findings

The mechanical failure was directly linked to the lack of maintenance specified in the service bulletin. The worn and burned magneto cam follower is the primary factor that led to the engine stopping during flight.