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Accident
Last updated: 22 October 2017
Status:Definitief
Datum:maandag 2 april 1956
Tijd:08:10
Type:Boeing 377 Stratocruiser 10-30
Luchtvaartmaatschappij:Northwest Orient Airlines
Registratie: N74608
Constructienummer: 15954/50
Bouwjaar: 1949-10-10 (6 years 6 months)
Aantal vlieguren:18489
Motoren: 4 Pratt & Whitney R-4360-B6
Bemanning:slachtoffers: 1 / inzittenden: 6
Passagiers:slachtoffers: 4 / inzittenden: 32
Totaal:slachtoffers: 5 / inzittenden: 38
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:8,7 km (5.4 mijl) SW van Seattle/Tacoma International Airport, WA (SEA) (   Verenigde Staten)
Fase: Kruisvlucht (ENR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Seattle/Tacoma International Airport, WA (SEA/KSEA), Verenigde Staten
Vliegveld van aankomst:Portland International Airport, OR (PDX/KPDX), Verenigde Staten
Vluchtnummer: 2
Beschrijving:
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:

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."

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


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Seattle/Tacoma International Airport, WA en Portland International Airport, OR bedraagt 207 km (129 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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Boeing 377

  • 56 built
  • 5e ongeval
  • 5e dodelijk ongeval
  • 3e zwaarste ongeval (toen het plaatsvond)
  • 4e zwaarste ongeval (op dit moment)
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