Incident
Last updated: 19 April 2014
Statuts:Enquête Officielle
Date:lundi 2 mai 1988
Type/Sous-type:Boeing 747-123
Compagnie:United Air Lines
Immatriculation: N157UA
Numéro de série: 20106/79
Année de Fabrication: 1970-09-24 (17 years 8 months)
Equipage:victimes: 0 / à bord: 19
Passagers:victimes: 0 / à bord: 239
Total:victimes: 0 / à bord: 258
Dégats de l'appareil: Inconnu
Lieu de l'accident:près de Tokyo (   Japon)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Intern.
Aéroport de départ:Los Angeles International Airport, CA (LAX/KLAX), Etats-Unis d'Amérique
Aéroport de destination:Tokyo-Narita Airport (NRT/RJAA), Japon
Numéro de vol: 97
Détails:
United flight 97 experienced indications of uneven fuel flow from main tanks 2 and 3 at FL360 beginning about 4-hours after departure on an 11-hour transpacific flight. The fuel system had been set up for all engine feed from the nos 2 and 3 tanks. Although it was later established that the number 2 crossfeed valve failed in the closed position, the s/o informed the captain that the intransit light had illuminated when the valve selector was moved to the closed position - indicating normal crossfeed valve operation. Fuel system problem was misdiagnosed as a problem of faulty fuel gauge indications. Fuel monitoring indicated insufficient fuel flow from no 2 tank when crossfeeding. Engines 1, 3, and 4 flamed out when fuel was expended from all tanks except no 2. An emergency descent was made to destination Tokyo-Narita airport. The crew reported they used flaps-20, but DFDR showed flaps-1 was used for landing. Three tires blew on landing. All 3 flightcrew were qualified in the B747 in the 13-months before the incident.

PROBABLE CAUSE: "fluid,fuel..starvation / fuel system..improper use of..flight engineer / procedures/directives..improper..pilot in command."

Sources:
» NTSB


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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Los Angeles International Airport, CA et Tokyo-Narita Airport est de 8696 km (5435 miles).

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 tels qui sont connus à ce jour.
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