Event GAA18CA159

Factual narrative

The helicopter pilot reported that he entered a practice autorotation and intended to terminate the maneuver to a hover. During the flare phase of the maneuver, he allowed the rotor RPM to decay. He increased collective and subsequently added power with throttle. The nose of the helicopter yawed to the right and simultaneously the fuselage rolled to the left. He applied left pedal, but the left skid struck rising terrain and the helicopter entered dynamic rollover. The helicopter sustained substantial damage to the main rotor drive system and the tail rotor drive system. The pilot reported that there were no mechanical malfunctions or failures with the helicopter that would have precluded normal operation. The helicopter pilot reported that he entered a practice autorotation and intended to terminate the maneuver to a hover. During the flare phase of the maneuver, he allowed the rotor rpm to decay. He increased collective and subsequently added power with throttle. The nose of the helicopter yawed to the right and simultaneously the fuselage rolled to the left. He applied left pedal, but the left skid struck rising terrain and the helicopter entered dynamic rollover. The helicopter sustained substantial damage to the main rotor drive system and the tail rotor drive system. The pilot reported that there were no mechanical malfunctions or failures with the helicopter that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

• C Personnel issues-Task performance-Use of equip/info-Use of equip/system-Pilot - C
• C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Prop/rotor parameters-Not attained/maintained - C
• — Environmental issues-Physical environment-Terrain-Mountainous/hilly terrain-Contributed to outcome