Accident Overview
The accident involved a Cessna 421B aircraft that departed Montrose, Colorado, and later crashed in snow-covered mountainous terrain. The pilot, who held a private pilot certificate but was not instrument rated, operated the flight in visual flight rules conditions initially.
Flight Details
Radar data indicated that after departure, the airplane climbed from 14,300 to 16,600 feet mean sea level (msl) at a rate of 1,792 feet per minute. Approximately 19 seconds later, the aircraft lost 4,000 feet of altitude, resulting in a descent rate of 12,631 feet per minute. Subsequently, the airplane climbed back to 13,300 feet msl at a rate of 1,448 feet per minute before disappearing from radar coverage.
Weather Conditions
Snowmobilers present near the impact site at the time of the accident reported that snow showers reduced visibility to less than 1/2 statute mile. A pilot departing Telluride Regional Airport, located 33 nautical miles at a bearing of 045 degrees from the crash site, on a heading of 300 degrees at approximately 1015, stated that conditions were clear over Telluride. This pilot reported encountering weather at 12,000 feet msl during climbout and did not break out until reaching 22,000 feet msl. He also indicated no icing or turbulence was experienced during the climb.
Probable Cause
The official probable cause states: "The non-instrument rated pilot's intentional flight into IMC, and his subsequent spatial disorientation that resulted in an inadvertent stall. A factor was the snow showers weather condition."