What happened
During the takeoff phase, the pilot of the aircraft experienced a loud noise accompanied by severe engine vibrations. Realizing that returning to the airport was not possible, the pilot elected to land straight ahead. The aircraft came to rest approximately 500 to 700 feet beyond the departure end of the runway. There were no injuries reported.
The investigation
An examination of the engine revealed that the number 3 cylinder had separated from the engine case. Further inspection of the number 3 cylinder showed that the separation was caused by fatigue of the cylinder attachment studs and both through bolts. This fatigue originated in the lower aft stud and subsequently progressed to the remaining studs and bolts. At the time of the accident, the engine had accumulated 1,407 total hours of operation since its most recent overhaul.