Accident Sequence
The scheduled commuter flight was operating approximately 10 miles north of its destination airport under a special visual-flight-rules (SVFR) clearance. While descending for landing, the aircraft entered instrument meteorological conditions. The pilot reported initiating a gradual descent over an area characterized by featureless, snow-covered, down-sloping terrain in whiteout and flat light conditions. During the descent, a localized snow shower momentarily reduced forward visibility, preventing the pilot from discerning any terrain features. The airplane subsequently collided with terrain in an all-white snow and ice field, sustaining substantial damage.
Weather Conditions
At the time of the accident, the destination airport reported visibility of 1.5 statute miles in light snow and mist, with broken cloud layers at 900 and 1,600 feet and an overcast ceiling at 3,200 feet. The temperature and dew point were both 25 degrees Fahrenheit.
Pilot Report
The pilot stated there were no pre-accident mechanical problems with the airplane. He further noted that the accident could have been avoided if the flight had been conducted under an instrument-flight-rules (IFR) flight plan.
Probable Cause
The official probable cause of the accident was the pilot's continued flight into adverse weather and his failure to maintain clearance from terrain while on approach in flat light conditions.