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Accident
Last updated: 13 December 2017
Statuts:Enquête Officielle
Date:dimanche 6 septembre 1953
Heure:02:31
Type/Sous-type:Silhouette image of generic CONI model; specific model in this crash may look slightly different
Lockheed L-1049 Super Constellation
Compagnie:Northwest Orient Airlines
Immatriculation: N6214C
Numéro de série: 4014
Année de Fabrication: 1952
Heures de vol:4509
Moteurs: 4 Wright R-3350 (975C18CB1)
Equipage:victimes: 0 / à bord: 6
Passagers:victimes: 0 / à bord: 26
Total:victimes: 0 / à bord: 32
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Tacoma-McChord AFB, WA (TCM) (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Seattle/Tacoma International Airport, WA (SEA/KSEA), Etats-Unis d'Amérique
Aéroport de destination:Chicago-O'Hare International Airport, IL (ORD/KORD), Etats-Unis d'Amérique
Numéro de vol:8
Détails:
Northwest Super Constellation N6214C departed Seattle-Tacoma at 01:48 for a flight to Chicago. Shortly after takeoff the no. 3 prop oversped. The prop was feathered, but continued to rotate at 400rpm. While climbing through 5000 feet a severe loss of oil forced the crew to feather the no. 4 prop as well. It was decided to carry out an emergency landing at McChord AFB. Only the right hand main gear leg could be locked down prior to landing. This caused the plane to swerve off the runway, bursting into flames. All occupants were evacuated in time.

Probable Cause:

PROBABLE CAUSE: "A sequence of mechanical failures resulting in an emergency landing under adverse weather conditions with insufficient hydraulic pressure in the secondary system to extend fully the landing gear in the time available. A contributing factor was the design of the hydraulic system which did not permit use of the available pressure in the primary system for that purpose."

Sources:
» ICAO Accident Digest Circular 39-AN/34 (109-112)


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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Seattle/Tacoma International Airport, WA et Chicago-O'Hare International Airport, IL est de 2742 km (1714 miles).
Accident location: Approximate; accuracy within a few kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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