Incident
Last updated: 19 April 2014
Status:Definitief
Datum:maandag 2 mei 1988
Type:Boeing 747-123
Luchtvaartmaatschappij:United Air Lines
Registratie: N157UA
Constructienummer: 20106/79
Bouwjaar: 1970-09-24 (17 years 8 months)
Bemanning:slachtoffers: 0 / inzittenden: 19
Passagiers:slachtoffers: 0 / inzittenden: 239
Totaal:slachtoffers: 0 / inzittenden: 258
Schade: Onbekend
Plaats:nabij Tokyo (   Japan)
Fase: Kruisvlucht (ENR)
Soort vlucht:Internationale lijnvlucht
Vliegveld van vertrek:Los Angeles International Airport, CA (LAX/KLAX), Verenigde Staten
Vliegveld van aankomst:Tokyo-Narita Airport (NRT/RJAA), Japan
Vluchtnummer: 97
Beschrijving:
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."

Bronnen:
» NTSB


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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 Los Angeles International Airport, CA en Tokyo-Narita Airport bedraagt 8696 km (5435 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs 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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