NTSB Identification: ANC01LA034.
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Nonscheduled 14 CFR
Accident occurred Wednesday, January 31, 2001 in Crooked Creek, AK
Probable Cause Approval Date: 02/20/2002
Aircraft: Douglas DC-6B, registration: N4390F
Injuries: 3 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The certificated airline transport captain related that the purpose of the flight was to deliver about 4,800 gallons of fuel oil to the remote mining site. He said that the 5,400 feet long by 100 feet wide airstrip was situated within hilly, snow-covered terrain. He added that the airstrip has a 7 percent uphill grade. Flat light conditions existed at the airstrip, and light snow showers were present, with visibility reported at 2 miles. The captain stated that during final approach, as the airplane passed over the airstrip threshold, flat light conditions made it very difficult to discern where the airstrip surface was. He said that the initial touch down was "firm", but was thought to be within acceptable tolerances. Just after touchdown, the left wing broke free from the airplane at the wing to fuselage attach point. The airplane veered to the left, and off the left side of the runway. The captain said that the airplane's computed landing weight was 92,260 pounds.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The flight crew's misjudged flare while landing. Factors associated with the accident were flat light conditions, snow-covered terrain, and an uphill runway grade. Full narrative available
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