Amateur-built MH-1 N32KS accident near Beach City, Ohio

Probable cause

The total loss of engine power for reasons that could not be determined based on the available evidence.

NTSB analysis

The private pilot, who did not hold a rotorcraft rating, reported that he departed on a maintenance flight to track and balance the experimental, amateur-built helicopter's main rotor. As he was making the approach to land, the helicopter was about 40 ft above ground level when the engine lost total power with no warning. He entered an autorotation for the forced landing, but within seconds the helicopter impacted terrain, the skids collapsed, and it rolled on its side. A postaccident engine run/test was conducted, and the engine started with no hesitation; however, the run time was limited due to damaged cooling fans. The postaccident examination of the airframe and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. Thus, the reason for the total loss of engine power could not be determined.

Text from the NTSB. Open the NTSB docket for CEN18LA239 for the full record.