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Last updated: 22 April 2021
Estado:Final
Fecha:lunes 4 diciembre 1978
Hora:19:45 MST
Tipo:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 300
Operador:Rocky Mountain Airways
Registración: N25RM
Numéro de série: 387
Año de Construcción: 1973
Horas Totales de la Célula:15145
Motores: 2 Pratt & Whitney Canada PT6A-27
Tripulación:Fatalidades: 1 / Ocupantes: 2
Pasajeros:Fatalidades: 1 / Ocupantes: 20
Total:Fatalidades: 2 / Ocupantes: 22
Daños en la Aeronave: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:15 km (9.4 milles) ENE of Steamboat Springs, CO (   Estados Unidos de América)
Fase: En ruta (ENR)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Steamboat Springs Airport, CO (SBS/KSBS), Estados Unidos de América
Aeropuerto de Llegada:Denver-Stapleton International Airport, CO (DEN/KDEN), Estados Unidos de América
Número de Vuelo: 217
Descripción:
The aircraft took off from Steamboat Springs at 18:55 but was forced to return after encountering severe icing conditions. The Twin Otter struck a mountain at 10530 feet.

Probable Cause:

PROBABLE CAUSE: "Severe icing and strong downdrafts 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 authorised by company directive." 

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 150 days (5 months)
Accident number: NTSB/AAR-79-06
Download report: Final report

Fuentes:
» NTSB Safety Recommendations A-79-70
» NTSB-AAR-79-6


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NTSB issued 4 Safety Recommendations

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Steamboat Springs Airport, CO to Denver-Stapleton International Airport, CO as the crow flies is 186 km (116 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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