Incident Overview
A twin-turboprop airplane experienced a runway excursion during a night landing on a snow-covered runway. The aircraft drifted left into deeper snow, struck a snow bank, and came to a stop.
Runway Conditions
The flightcrew had been informed that the runway was cleared to its full width of 150 feet, with a covering of 1/4 inch of snow over patches of ice. However, post-accident observation revealed that snow banks 2 to 4 feet high were present on both sides of the runway. Additionally, snow extended inward from both sides for approximately 20 feet at a depth of 4 to 6 inches. A snow bank also extended from a taxiway approximately 20 feet onto the runway.
Aftermath
The aircraft came to a stop after striking the snow bank. No further details about the condition of the aircraft or occupants were provided in the source.