Accident Overview
A helicopter experienced an engine failure and subsequently collided with trees, rolling over during a forced landing. The pilot had been conducting sightseeing flights with passengers for several hours prior to the accident. After the final flight, the pilot and his wife departed a city park to return to the aircraft's home base. Approximately two miles into the flight, the engine failed.
Forced Landing Attempt
Due to strong winds, the pilot was unable to reach a vacant school yard and was forced to land in an area with trees, resulting in the collision and rollover.
Engine History and Oil Consumption
The aircraft engine had a known history of oil consumption, using about one quart of oil per hour. The pilot stated that he had flown for over an hour since last checking the oil level. Following the accident, the engine oil tank was inspected. It was found empty, with no damage to the tank and no evidence of leakage.
Findings
Examination of the engine revealed damage consistent with extreme overheating. The manner of the engine failure was representative of an oil depletion failure.