Accident Overview
Immediately after takeoff, the pilot became unsure of clearing the surrounding mountainous terrain. In response, a 180-degree turn was initiated. During this maneuver, the pilot encountered a strong downdraft.
Flight Path and Witness Observations
According to passengers and witnesses, the airplane maintained an unusual nose-high attitude and low airspeed from the moment of lift-off until just before impact. This behavior was noted throughout the flight.
Takeoff Location
The pilot had taken off from a rough area on the frozen lake. This location was different from the usual takeoff area used for such operations.
Sequence of Events
The events began with the takeoff from the frozen lake's rough surface. Shortly after becoming airborne, the pilot's uncertainty about clearing the terrain led to the decision to turn around. As the airplane executed the 180-degree turn, a strong downdraft was encountered. The combined effects of the nose-high attitude, low airspeed, and downdraft preceded the impact with terrain.