Date: December 04, 1978
Time: 19:45
Location: Near Steamboat Springs, Coloado
Operator: Rocky Mountain Airways
Flight #: 217
Route: Steamboat Springs - Denver
AC Type: de Havilland Canada DHC-6 Twin Otter 300
Registration: N25RM
cn / ln: 387
Aboard: 22   (passengers:20  crew:2)
Fatalities: 2   (passengers:1  crew:1)
Ground: 0
Summary: Forced to return to Steamboat Springs due to severe icing, the plane crashed into a 10,530 ft. mountain. Severe icing and strong downdraughts associated with a mountain wave which combined to exceed the aircraft's capability to maintain flight. Contributing to the accident was the Captain's decision to fly into probable icing conditions that exceeded the conditions authorized by company directives.

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