Incident Overview
A single-pilot aircraft encountered an engine oil pressure anomaly while cruising at flight level 240 (FL240). The pilot observed the oil pressure gradually drop from the normal range into the caution range, accompanied by a decrease in manifold pressure. In response, the pilot requested and received vectors for a precautionary landing at an airport located short of the intended destination.
Sequence of Events
During the descent, the oil pressure continued to decline, reaching zero, and the engine subsequently lost all power. Despite locating the airport below an overcast ceiling, the loss of engine power prevented the aircraft from reaching the runway. The airplane impacted trees approximately 1,200 feet from the airport boundary.
Maintenance History
The aircraft's six engine cylinder assemblies had been replaced 7 hours prior to the accident. The reason for the oil loss could not be identified during subsequent examinations.
Post-Accident Examination
A thorough examination of the engine and turbochargers failed to reveal the source of the oil loss. The investigation did not determine why the oil pressure dropped or why the engine failed.