What happened
The pilot was advised that smoke was trailing from the aircraft during the initial climb out. Because of instrument meteorological conditions at the departure airport, the pilot decided to continue climbing rather than return immediately, intending to divert to an alternate airport located approximately 26 nautical miles to the north. The pilot climbed to 4,500 feet mean sea level to reach visual meteorological conditions.
During this climb, an oil warning light illuminated on the instrument panel. The pilot requested radar vectors to another airport and continued to seek visual conditions. Approximately 20 nautical miles south of the destination, while descending in visual conditions, the engine oil pressure gauge indicated zero pressure. The engine subsequently seized, prompting the pilot to execute a forced landing in a nearby field.
During the landing roll, the left main landing gear was severed, and the left wing sustained damage. After the aircraft came to a stop, oil was observed on top of the engine cowling and along the fuselage.
The investigation
A mechanical examination of the engine revealed that the engine case had fractured above the number six cylinder. Investigators inspected all oil fittings for proper security and tightness and performed pressure checks. No indications of leakage or blockage were found in the fittings.