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Accident
Last updated: 13 December 2017
Statuts:Enquête Officielle
Date:jeudi 14 juillet 1960
Heure:04:30
Type/Sous-type:Silhouette image of generic DC7 model; specific model in this crash may look slightly different
Douglas DC-7C
Compagnie:Northwest Orient Airlines
Immatriculation: N292
Numéro de série: 45462/925
Année de Fabrication: 1958
Heures de vol:9233
Equipage:victimes: 0 / à bord: 7
Passagers:victimes: 1 / à bord: 51
Total:victimes: 1 / à bord: 58
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:8 km (5 milles) NE de Polillo Island (   Philippines)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Intern.
Aéroport de départ:Okinawa-Naha Airport (OKA/ROAH), Japon
Aéroport de destination:Manila International Airport (MNL/RPLL), Philippines
Numéro de vol: 1-11
Détails:
Flight 1-11 arrived at Okinawa at 16:25 following a flight from New York via Seattle, Anchorage Cold Bay and Tokyo. The flight departed Okinawa at 17:12 GMT for the last leg of the flight to Manila. Two hours after takeoff, at 03:15 local time, the no. 2 engine experienced a power loss, indicated by a drop in mean effective pressure and manifold pressure. Believing the difficulty was carburetor icing the crew tried to correct the problem. The problems persisted and the captain then noticed the oil-out temperature for no. 2 engine rising. Attempts to feather the no. 2 propeller failed and the flight was cleared to descend from FL180 to FL100. An emergency was declared at 03:40. While at 9000 feet it was attempted to actuate the firewall shutoff valve, depriving the engine of lubricant and thus to stop the (no. 2) engine rotation. The propeller then wrenched free of the engine and struck the fuselage, slashing a 15inch hole. There was a continuous fire warning from the no. 2 engine and a fire on the wing was reported to Manila at 04.20. A 3000 feet/min descent from 9000 feet was made. At 1000 feet descent rate was decreased to 100-200 feet/min and a ditching was carried out. Upon final contact with the water, the aft end of the fuselage broke free at the rear of the pressure bulkhead. At the same time the right wing as torn free and the engines separated. The wing floated for 3 hours, temporarily serving as a liferaft for several passengers. The remainder of the fuselage, sank some 8 or 10 minutes after impact. All occupants were rescued by US Coast Guard and US Navy aircraft 4-6 hours after the accident. Of the 58 occupants, 44 suffered minor injuries and one woman passenger died.

Probable Cause:

PROBABLE CAUSE: "The accident was due to the internal failure of No.2 engine, which resulted in oil contamination, loss of oil supply, subsequent loss of the No.2 propeller assembly, and fire in flight, which necessitated a ditching."



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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 Okinawa-Naha Airport et Manila International Airport est de 1462 km (914 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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