Accident Overview
During cruise flight at 8,000 feet in visual flight rules conditions, the pilot reported a total loss of engine power. At the time, the airplane was approximately 4 miles from an airport with a 2,920-foot long asphalt runway. The air traffic controller initially cleared the airplane to an airport more than 20 miles away, then directed it to an airport located on the other side of a ridgeline about 12 miles from the airplane's position. After the pilot reported that he could not reach that airport, the controller directed the airplane to the airport with the 2,920-foot runway.
Impact Sequence
The airplane struck the top of a residence and a tree before coming to rest inverted in a field, approximately 1.5 miles east of the runway.
Engine Examination
Streaks of oil were present on the bottom of the fuselage, and small holes were observed on the top portion of the engine crankcase near the number 5 cylinder. Examination of the engine revealed that the number 5 piston had separated from its respective connecting rod. The bottom portion of the number 5 piston was broken into several small pieces, which were found within the engine. Examination of the intact fracture surfaces showed no evidence of fatigue or preexisting cracks. However, only 75 percent of the number 5 piston boss area, and less than 25 percent of the number 5 piston skirt below the upper oil control ring, were recovered.
Engine Service History
The engine had been operated for approximately 70 hours since being rebuilt by its manufacturer and was installed in the accident airplane about 11 months prior to the accident.