Departure and Flight
The pilot initiated a takeoff from a clear area in front of a private residence, heading toward a valley. According to the investigation, the helicopter accelerated in ground effect for approximately 370 feet, following an airspeed-over-altitude departure profile.
Power Line Strike
During the flight, the helicopter flew directly into two distribution power lines located about four feet above the elevation of the takeoff area. The power poles supporting these lines were situated on lower-elevation terrain. The main rotor blade tip, chin bubble, and tail rotor drive shaft were broken during the collision, causing the pilot to lose control.
Loss of Control and Crash
After the strike, the helicopter veered 90 degrees to the right and crashed approximately one-quarter of a mile from the power lines. The poles supporting the lines were positioned behind trees and were not visible from the takeoff area, according to the investigation.
Pilot's Prior Flights
The pilot had conducted two local flights over the same area earlier in the day and had not noted the poles or lines during those flights.
Aircraft Equipment
The helicopter was not equipped with optional wire cutters.