Accident Overview
According to the pilot, while executing a 180-degree turn, the boost pump fail light illuminated. Shortly thereafter, the engine shut down at approximately 150 feet above ground level (AGL). The pilot selected a field for an emergency landing and initiated an autorotation.
During the touchdown phase of the autorotation, the helicopter collided with a log and subsequently rolled over. The pilot reported that there was insufficient rotor RPM to prevent the rollover.
Post-Accident Examination
Examination of the engine concluded that the fuel supply system had an air leak between the fuel tank and the engine-driven fuel pump. Additionally, both the airframe and engine fuel filters were found to be clogged with an unidentifiable brownish, jelly-like substance.
Maintenance Log Review
A review of the maintenance log revealed that the last 100-hour inspection was performed 98 flight hours before the accident. There were no further indications of any other maintenance having been performed on the fuel system.
Summary of Findings
The accident sequence involved an engine failure during a turn at low altitude, leading to an autorotation and collision with a ground obstacle. The post-accident investigation identified a fuel system air leak and clogged fuel filters as mechanical anomalies.