At 0953 Eastern time, the airplane was substantially damaged when it collided with trees and terrain following a loss of engine power. The Airline Transport pilot was seriously injured; visual conditions prevailed. The pilot stated that, while on approach, the engine ran roughly, then completely lost power. He switched fuel tanks, and attempted an engine restart, but was unsuccessful. The pilot then maneuvered the airplane toward a snow-covered field. The accident scene displayed considerable evidence of there being ample fuel aboard the aircraft and the engine was subsequently started, and run continuously on the airframe without interruption.