Brantly B 2B N2266U accident near Galena, Missouri

Probable cause

The pilot’s loss of control for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.

NTSB analysis

Two witnesses saw the helicopter circle three times at low altitude. During the third pass, the helicopter descended to about 20 ft above the ground before it entered a climb. As it climbed, the helicopter entered a spin and descended to the ground. Both of the witnesses stated that the engine continued to run after impact. A postaccident examination of the wreckage did not reveal any anomalies that would have precluded normal operation of the helicopter, and the reason for the loss of control could not be determined. Review of the pilot's logbook showed he had about 192 hours of helicopter flight time but did not hold a rotorcraft rating.

Text from the NTSB. Open the NTSB docket for CEN16LA135 for the full record.