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Narrative: High rate of descent. High g impact. Landing gear collapse. One fatality, two injured.
The accident was caused by PIC's errors in the helicopter piloting technique resulted in loss of monitoring for flight and rotor speed during the emergency landing with autorotting rotor caused by unintentional helicopter engine shutoff by the passenger located in the right-hand seat of the pilot cabin. The contributing factors were: - deficiencies in location and route of the radio headset chord allowing free encounter of overhanging part of the chord under handles of fuel emergency shutoff valve which can provoke the valves shutoff; - the lack of protection of handles of fuel emergecny shutoff valves from foreign objects and radio headset chord encounter under them;
- non-compliance with FAR-128 by PIC in the part of safety belts usage by the passenger located in the right-hand seat of the pilot cabin.
The appropriate recommendations based on the investigation results for improving flight safety are presented.