Accident Sequence
During a local sightseeing flight, the helicopter impacted power lines while maneuvering, crashed into a river, and came to rest 90 percent submerged in the water approximately 1,500 feet from the power lines. According to the operator, the helicopter was providing sightseeing rides for guests at a birthday party.
Witness and Passenger Accounts
Approximately 1 hour prior to the accident, a witness observed the accident helicopter flying recklessly near his residence. According to the accident flight passengers, the helicopter departed and flew west toward a nearby river. One passenger reported, "Once we arrived [at the river], he descended to within a few feet over the riverbed and then flew up into the power lines." Another passenger, seated in the rear center seat and looking out the windscreen, stated he could see the river and the sun out of the windscreen. The passengers did not see the power lines; however, one observed sparks and flying debris after contact with the power lines. The passengers stated the helicopter shook violently and impacted the water.
Examination Findings
Examination of the helicopter revealed the power lines impacted the helicopter's upper wire cutter, main rotor mast, and main rotor blade pitch links. Examination of the airframe and engine revealed no anomalies that would have precluded normal operation prior to impact with the power lines.
Environmental Conditions
The reported sunset on the day of the accident was 3 minutes after the impact with the power lines.