What happened
During the cruise phase of flight, the aircraft experienced a loss of engine power. In response, the pilot declared an emergency and initiated maneuvers to perform a forced landing in a nearby field. During the approach to the intended landing area, the aircraft struck a tree, causing it to fall to the ground and burst into flames.
The investigation
An examination of the engine revealed that no measurable quantity of oil remained in the sump, with only dark black residual oil present. Investigators discovered that the crankcase had been breached, noting large holes located above the #2 and #6 cylinders.
Further inspection of the internal valve train components showed widespread spalling of the tappet bodies. The camshaft also exhibited severe wear, specifically affecting four of the nine cam lobes. Additionally, the crankshaft main bearings contained dirt and metal particles that had contaminated the oil supply.