Accident
Last updated: 16 September 2014
Estado:Final
Fecha:lunes 2 abril 1956
Hora:08:10
Tipo:Boeing 377 Stratocruiser 10-30
Operador:Northwest Orient Airlines
Registración: N74608
Numéro de série: 15954
Año de Construcción: 1949
Horas Totales de la Célula:18489
Motores: 4 Pratt & Whitney R-4360-B6
Tripulación:Fatalidades: 1 / Ocupantes: 6
Pasajeros:Fatalidades: 4 / Ocupantes: 32
Total:Fatalidades: 5 / Ocupantes: 38
Daños en la Aeronave: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:8,7 km (5.4 milles) SW de la costa de Seattle/Tacoma International Airport, WA (SEA) (   Estados Unidos de América) show on map
Fase: En ruta (ENR)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Seattle/Tacoma International Airport, WA (SEA/KSEA), Estados Unidos de América
Aeropuerto de Llegada:Portland International Airport, OR (PDX/KPDX), Estados Unidos de América
Número de Vuelo: 2
Descripción:
Northwest Flight 2 (Seattle-Portland-Chicago-New York) took off from Seattle at 08:06. As the aircraft reached 2000 feet, at 145 knots airspeed, the flaps were retracted. Severe buffeting started and the aircraft tended to roll to the left. Thinking it was an asymmetric flap condition, the captain reduced power to stop the buffeting, but of no avail. Full power was applied again and plans were made to divert to McChord AFB. The plane continued to lose altitude and was not able to reach McChord. A ditching was carried out in Puget Sound. The aircraft sank 15 minutes after the ditching. It appeared that the aircraft had taken off with the engine cowl flaps fully open. Though not emphasized as a contributory factor, it must be noted that the cowl flap control on the Boeing 377 and Lockheed L-1049 move in opposite directions for the closing of the cowls. Most of the flight engineers flying time had been on L-1049 and DC-6 aircraft.

PROBABLE CAUSE: "The incorrect analysis of control difficulty which occurred on retraction of the wing flaps as a result of the flight engineer's failure to close the engine cowl flaps - the analysis having been made under conditions of great urgency and within an extremely short period of time available for decision."

Fuentes:
» ICAO Accident Digest No.8, Circular 54-AN/49 (72-75)


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Map
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 Seattle/Tacoma International Airport, WA to Portland International Airport, OR as the crow flies is 207 km (129 miles).

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Boeing 377

  • 5th loss
  • 56 built
  • 3rd worst accident (a la hora)
  • 4th worst accident (actualmente)
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 Estados Unidos de América
  • 233rd worst accident (a la hora)
  • 571st worst accident (actualmente)
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