ASN Aircraft accident de Havilland Canada DHC-6 Twin Otter 300 N540N Barter Island, AK
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Status:Accident investigation report completed and information captured
Date:Tuesday 12 March 1985
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 300
Operator:Seair Alaska Airlines
Registration: N540N
MSN: 401
First flight: 1973
Total airframe hrs:13652
Engines: 2 Pratt & Whitney Canada PT6A-27
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 2
Total:Fatalities: 0 / Occupants: 4
Aircraft damage: Substantial
Aircraft fate: Written off (damaged beyond repair)
Location:Barter Island, AK (   United States of America)
Phase: Approach (APR)
Nature:Domestic Non Scheduled Passenger
Departure airport:Prudhoe Bay Airport, AK (PUO), United States of America
Destination airport:Barter Island Airport, AK (BTI/PABA), United States of America
The aircraft had to carry out a missed approach to a temporary winter landing strip and crashed in a steep nose down attitude, about 900 m past the runway end due to ice accretion (3/16 inch) on the wings. The de-ice boots were not used.

Probable Cause:

"Flight manuals..not followed..pilot in command
Weather condition..icing conditions
Altitude..inadequate..pilot in command
Terrain condition..snow covered
Overconfidence in aircraft's ability..pilot in command
Inadequate surveillance of management
Weather condition..fog
Weather evaluation..inaccurate..pilot in command
Company-induced management
Inadequate surveillance of operation..FAA
Light condition..dark night
In-flight planning/decision..poor..pilot in command
Expectancy..other person
Insufficient standards/requirements,operation/ management
Light condition..dark night
Weather evaluation..inaccurate..pilot in command
Fatigue (flight and ground schedule)..pilot in command
Flight into known adverse weather..intentional..pilot in command
Anti-ice/deice system..not used..pilot in command"

Loss of control

» NTSB id ANC85FA054


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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 Prudhoe Bay Airport, AK to Barter Island Airport, AK as the crow flies is 195 km (122 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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