THE DTSB
The DTSB determines the Probable Cause of this accident to be Pilot Error, in that the helicopter pilot did maneuver the helicopter very low level near the reservoir for unknown reasons, whereupon the main rotor blades became entangled with an existing power line, causing the fall from about 40 feet to the frozen ice reservoir. The helicopter impacted on its side and partly broke through the ice. The pilot was killed on impact and was trapped in water below the ice level. The other occupant was injured but escaped on his own power onto the ice and was found walking on the ice at the crash scene when rescue persons arrived.