What happened
During a departure from runway 17, smoke was seen emanating from the right engine of the aircraft. The pilot experienced a loss of power and attempted a right turn to return to the runway; however, the pilot subsequently reported that both engines had failed. The aircraft impacted rough, rocky terrain located approximately one-quarter mile southwest of the runway threshold, resulting in extensive damage to the airframe. The accident resulted in one fatality and one serious injury.
Prior to the accident, the aircraft had undergone a change in ownership. During a pre-purchase inspection conducted in Florida, metal debris was identified within the oil screens of both engines. Although the oil was flushed and replaced, subsequent engine testing again revealed the presence of metal particles. In May 198ly, the right engine had been swapped with an engine from a different aircraft. Following a flight to Oakland, California, for cosmetic upgrades, a local mechanic observed metal particles in the oil screens of both engines and suggested an oil analysis, but this recommendation was declined by the ferry pilot.
Findings
An examination of the wreckage determined that both engines failed due to detonation. Evidence of heavy oil streaking was found behind the right engine, with some oil streaks also present behind the left engine. Technical inspection revealed that the crankshaft and rod bearing surface of the right engine was 0.010 inches below standard specifications, though the rod bearings themselves were of standard size.
Contributing factors included improper maintenance and the operation of an aircraft with known mechanical deficiencies. The investigation noted excessive wear in both powerplants, improper use of powerplant controls by the pilot, and subsequent overtemperature conditions leading to detonation. Additionally, the pilot's emergency response was noted as improper, specifically regarding premature landing gear extension and a failure to adequately reduce drag following the loss of engine power. The pilot also lacked sufficient experience with multi-engine aircraft and this specific model.