Incident Details
The pilot reported that while conducting an aerial application flight, he lined up for a downwind spray pass at an approximate height of three feet above the crop. During the pass, the engine sputtered and then lost power. The pilot entered an autorotation and attempted to slow the aircraft from 50 MPH before the helicopter impacted terrain and came to rest on its side.
Investigation Findings
An FAA Inspector's report noted that the helicopter had been refueled for the second time during the job about one hour prior to the accident. The refueling did not bring the helicopter to its proper fuel quantity, causing the pilot to miscalculate the fuel on board. Post-impact inspection revealed an estimated two gallons or less of fuel in the tank, with no ruptures found in the fuel tank. Additionally, no odor of fuel was detected at the accident site during the on-scene inspection.
Engine Tests
Post-recovery engine tests demonstrated that the engine operated without any significant issues. Fuel contamination was ruled out as a factor in the loss of engine power.