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Last updated: 18 October 2019
Status:Final
Date:Friday 20 August 1999
Time:13:50
Type:Silhouette image of generic DH3T model; specific model in this crash may look slightly different
de Havilland Canada DHC-3T Vazar Turbine Otter
Operator:Ketchum Air Service
Registration: N888KA
C/n / msn: 106
First flight: 1956
Total airframe hrs:3712
Engines: 1 Pratt & Whitney Canada PT6A-135
Crew:Fatalities: 0 / Occupants: 1
Passengers:Fatalities: 0 / Occupants: 3
Total:Fatalities: 0 / Occupants: 4
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:48 km (30 mls) W of Port Alsworth, AK (   United States of America)
Phase: Takeoff (TOF)
Nature:Domestic Non Scheduled Passenger
Departure airport:?
Destination airport:Tutna Lake, AK, United States of America
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:

PROBABLE CAUSE: "The pilot's inadvertent retraction of the trailing edge flaps during the takeoff run."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 10 months
Accident number: ANC99LA122
Download report: Summary report

Sources:
» NTSB


Photos

photo of DHC-3T-Vazar-Turbine-Otter-N888KA
accident date: 20-08-1999
type: de Havilland Canada DHC-3T Vazar Turbine Otter
registration: N888KA
photo of DHC-3T-Vazar-Turbine-Otter-N888KA
accident date: 20-08-1999
type: de Havilland Canada DHC-3T Vazar Turbine Otter
registration: N888KA
 
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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