Bell Helicopter Textron 206L-1 N5017G accident near Chimney Rock, Montana

Probable cause

The pilot’s failure to maintain adequate clearance from the terrain while performing a lowaltitude circling takeoff maneuver, which resulted in a dynamic rollover.

NTSB analysis

The pilot and pilot-rated passenger were on a personal flight practicing offairport landings. After landing in an open meadow, the pilot elected to depart using a lowaltitude circling maneuver. The pilot stated the purpose of the maneuver was to gain effective translational lift. During the maneuver, as the helicopter accelerated, it began to descend, and the left skid contacted the terrain, resulting in a dynamic rollover. The helicopter sustained substantial damage to the fuselage, , main rotor system, tail rotor system, and empennage.

The pilot stated that they received training in circling takeoff maneuvers during their commercial pilot training and had previously performed similar maneuvers.

The pilot reported there were no pre-accident mechanical malfunctions or anomalies with the helicopter that would have precluded normal operation.

Text from the NTSB. Open the NTSB docket for WPR26LA146 for the full record.