The pilot's failure to maintain adequate clearance from terrain during the landing roll, which resulted in a collision with a snow berm with the left main landing gear, and subsequent damage to the right wing. Factors contributing to the accident were dark night lighting conditions, and a snow berm along the edge of the runway.

THE PILOT-IN-COMMAND'S FAILURE TO MAINTAIN THE PROPER AIRSPEED WHICH RESULTED IN AN INADVERTENT STALL AND HIS FAILURE TO INITIATE A GO-AROUND WHEN THE RUNWAY ENVIRONMENT WAS NOT CLEARLY DEFINED. A FACTOR IN THE ACCIDENT WAS THE FOG.