Accident de Havilland Canada DHC-6 Twin Otter 300 N540N,
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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
Owner/operator:Seair Alaska Airlines
Registration: N540N
MSN: 401
Year of manufacture:1973
Total airframe hrs:13652 hours
Engine model:Pratt & Whitney Canada PT6A-27
Fatalities:Fatalities: 0 / Occupants: 4
Aircraft damage: Substantial, written off
Location:Barter Island, AK -   United States of America
Phase: Approach
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Prudhoe Bay Airport, AK (PUO)
Destination airport:Barter Island Airport, AK (BTI/PABA)
Confidence Rating: Accident investigation report completed and information captured
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.

"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"


NTSB id ANC85FA054

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