Accident de Havilland Canada DHC-6 Twin Otter 300 N25RM, Monday 4 December 1978
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Date:Monday 4 December 1978
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different    
de Havilland Canada DHC-6 Twin Otter 300
Owner/operator:Rocky Mountain Airways
Registration: N25RM
MSN: 387
Year of manufacture:1973
Total airframe hrs:15145 hours
Engine model:Pratt & Whitney Canada PT6A-27
Fatalities:Fatalities: 2 / Occupants: 22
Other fatalities:0
Aircraft damage: Destroyed, written off
Location:15 km ENE of Steamboat Springs, CO -   United States of America
Phase: Take off
Nature:Passenger - Scheduled
Departure airport:Steamboat Springs Airport, CO (SBS/KSBS)
Destination airport:Denver-Stapleton International Airport, CO (DEN/KDEN)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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: "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:
Investigating agency: NTSB
Report number: DCA79AA003
Status: Investigation completed
Duration: 9 months
Download report: Final report


NTSB Safety Recommendations A-79-70


Revision history:


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