Date: | Friday 20 August 1999 |
Time: | 13:50 |
Type: | de Havilland Canada DHC-3T Vazar Turbine Otter |
Owner/operator: | Ketchum Air Service |
Registration: | N888KA |
MSN: | 106 |
Year of manufacture: | 1956 |
Total airframe hrs: | 3712 hours |
Engine model: | Pratt & Whitney Canada PT6A-135 |
Fatalities: | Fatalities: 0 / Occupants: 4 |
Aircraft damage: | Substantial, repaired |
Category: | Accident |
Location: | 48 km W of Port Alsworth, AK -
United States of America
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Phase: | Take off |
Nature: | Passenger - Non-Scheduled/charter/Air Taxi |
Departure airport: | |
Destination airport: | Tutna Lake, AK |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:At the beginning of the takeoff water run from a remote lake, the hydraulically actuated flaps were retracted from the fully extended (takeoff) to 1/2 position. The pilot said the airplane came up 'on step' normally, and he then attempted to pump the flaps to the fully extended position. The airplane did not become airborne, and he realized the flap selector handle was in the 'up,' not 'down,' position. The airplane struck the four feet high bank at the end of the lake, separating the floats. The pilot initially indicated he forgot to switch the flap selector handle to 'down.' He later stated he thought he had positioned it correctly, but his shirt sleeve may have snagged the handle and repositioned it.
PROBABLE CAUSE: "The pilot's inadvertent retraction of the trailing edge flaps during the takeoff run."
Accident investigation:
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Investigating agency: | NTSB |
Report number: | ANC99LA122 |
Status: | Investigation completed |
Duration: | 10 months |
Download report: | Final report |
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Sources:
NTSB
Images:
photo (c) Gary Kegel; 48 km W of Port Alsworth, AK
photo (c) Gary Kegel; 48 km W of Port Alsworth, AK
Revision history:
Date/time | Contributor | Updates |