Primary finding
Probable cause
The flight's encounter with severe downdrafts during cruise flight. Contributing factors were the pilot's inadvertent selection of unsuitable terrain with hidden obstructions.
Investigator assessment
Analysis narrative
The pilot of the motor glider reported that he had been airborne on a local soaring flight for about 30 minutes when the flight encountered "severe downdrafts." Due to the downdrafts, he was unable to return to the airport and had to land in an alfalfa field. During the landing roll, the glider collided with a ditch and a fence that were not visible during the landing approach.
Source record
Factual narrative
The pilot of the motor glider reported that he had been airborne on a local soaring flight for about 30 minutes when the flight encountered "severe downdrafts." Due to the downdrafts, he was unable to return to the airport and had to land in an alfalfa field. During the landing roll, the glider collided with a ditch and a fence that were not visible during the landing approach.