Flight Attempt
The pilot stated that he attempted to take off on Runway 13 but aborted that takeoff midfield. He noticed the wind favored Runway 31, so he switched runways. The subsequent takeoff on Runway 31 was described as normal, with a rate of climb of 300 feet per minute and an airspeed of about 80 mph. During the climb, as he was about to make a right turn into the valley, he felt a downdraft to the right side of the airplane. The pilot reported that there was no mechanical malfunction.
Witness Observation
A witness reported seeing the airplane approaching a hill and making a steep right turn before it descended into the trees.
Airport Terrain
According to the FAA, the airport is situated in a mountain valley with hills on both sides. A 400-foot hill is located about 1500 feet beyond the departure end of Runway 31. Local pilots, when departing, usually turn 60 degrees left or right to avoid the hill.