Event Details
According to the pilot, thunderstorms were 'developing rapidly' to the left of the flight path but appeared to be at a safe distance. The pilot then noticed dust and debris picking up on the ground about half a mile ahead and to the left. After initiating a right turn away from the storm area, the pilot stated that he 'could not control the helicopter' and does not recall the ensuing ground impact.
Meteorological Conditions
Doppler radar images for the time and area of the accident showed rapidly developing weather echoes in the vicinity. Base velocity data indicated a significant thunderstorm outflow boundary located just northwest of the accident site at the approximate time of the accident. Several witnesses in the area reported high winds and turbulent conditions.
Wreckage Examination
Examination of the structural components, tail and main rotor drive systems, engine components, and flight controls that were not destroyed by impact forces and postimpact fire did not reveal evidence of failure prior to impact.