FUEL EXHAUSTION CAUSING 3 ENGINES TO FLAME OUT AT THE END OF AN EXTENDED OVER WATER OPERATION. ACFT CONTINUED DESCENT TO DESTINATION WITN 1 ENGINE OPERATING.

Narrative

FLT DEPARTED LAX 5/88; DEST TOKYO; JAPAN. THE FLT CREW CONSISTED OF THE FOLLOWING: CAPT; F/O AND S/O. PAX COUNT WAS 259. THERE WERE 14 F/A'S. TKOF FUEL LOAD 312000#. DEP; TKOF; CLB AND CRUISE WERE NORMAL IN ALL RESPECTS. APPROX 4 HRS INTO THE FLT; THE S/O BROUGHT TO THE ATTN OF THE CAPT AN APPARENT FUEL IMBALANCE BTWN FUEL TANKS. THIS ACFT DOES NOT HAVE A FLOW EQUALIZATION VALVE IN THE XFEED SYS. FUEL MGMNT PROCS WERE NORMAL TO THIS TIME. NORMAL FUEL BALANCING PROCS WERE INITIATED; BUT RESULTS DID NOT APPEAR SATISFACTORY. XFEED VALVES AND BOOST PUMPS APPEARED TO OPERATE NORMALLY. PREVIOUS ACFT LOGBOOK WRITE UPS INDICATED PROBABLE ACFT FUEL GAUGE PROBS. FUEL SYS; XFEED VALVE IN TRANSIT LIGHTS INDICATED MOVEMENT OF XFEED VALVES TO DESIRED POSITIONING AT ALL TIMES. CAPT AND S/O ENTERED INTO PROB RESOLUTION WHILE F/O FOCUSED ON NAV AND PLTING DUTIES. AS THE FLT PROGRESSED FURTHER TOWARD NARITA; THE APPARENT FUEL DISCREPANCIES INCREASED. AN ACFT TRIM CHK WAS MADE AND THE AILERON TRIM DID NOT MATCH THE FUEL LOAD AS CONFIGURED ON THE GAUGES. THE FLT CREW CONTINUED TO BE REASSURED THAT THE FUEL QUANTITY GAUGES WERE INACCURATE UNTIL THE #4 ENG FLAMED OUT. THE ENG RELIT ALMOST IMMEDIATELY AND RAN WELL FOR 35 MINS. AT THIS TIME; ENGS #1; 3 AND 4 FLAMED OUT DUE TO FUEL STARVATION. THE ACFT POS WAS 186 MI E OF NARITA. THE F/O DECLARED AN EMER AND TOKYO CTL CLRED THE FLT TO 10000'. A DSCNT PROFILE APPROXIMATING 250 KTS; INDICATED AIRSPD AND 500 FPM DSCNT ALLOWED THE ACFT TO ARRIVE IN A POS TO CONDUCT AN APCH AND LNDG AT NARITA W/O FURTHER INCIDENT. ALL XFEED VALVES WERE CHKED ON THE GND AT NARITA BY COMPANY MAINT PERSONNEL AND ALL OPERATED NORMALLY. THE ACFT WAS FERRIED BACK TO SAN FRANCISCO. HOWEVER; 2 XFEED VALVES FROZE IN THE OPEN POS DURING FLT APPROX 3 1/2 HRS AFTER TKOF FROM NARITA. AN IRREGULAR PROC UTILIZING THE FUEL JETTISON SYS IS USED BY COMPANY TO MOVE FUEL FROM AN INBOARD TANK WHEN AN INBOARD TANK XFEED VALVE IS INOP. THE XFEED VALVE INTRANSIT LIGHTS INDICATED NORMAL OPERATION ON THIS FLT. COMPANY SPECIFICALLY PROHIBITED USE OF THIS PROC TO BALANCE FUEL ON THIS DATE. CONSEQUENTLY; THE CREW DID NOT USE THIS PROC. COMPANY HAS NOW AUTHORIZED THE USE OF THIS IRREGULAR PROC TO BALANCE FUEL WHEN THE INBOARD TANKS ARE OUT OF BALANCE. IN ADDITION; COMPANY IS NOW INSERTING FUEL EQUALIZATION VALVES INTO ACFT AND THE OTHER NEW WDB. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE RPTR HAS NOT BEEN ABLE TO SOLVE THE MYSTERY OF WHY THE #2 XFEED VALVE INDICATED OPEN WHEN IN FACT IT WAS FROZEN IN THE CLOSED POS. S/O MAINTAINS HE SAW NORMAL TRANSIT LIGHT INDICATIONS WHENEVER HE CHANGED A VALVE POS. MFR COULD NOT VERIFY THAT THE TRANSFER LIGHT COULD APPEAR TO OPERATE NORMALLY WHEN THE VALVE DID NOT MOVE AS SELECTED. MAINT HISTORY ON THIS PARTICULAR ACFT INDICATED REPEATED FUEL INDICATION PROBS THAT HAVE SINCE BEEN DETERMINED TO BE THE RESULTS OF A COMBINATION OF XFEED VALVE PROBS AND NO EQUALIZER VALVES IN THE MANIFOLD. THE FLT CREW KNEW THEY HAD ENOUGH FUEL TO REACH THEIR DEST AND DID CAREFUL LOGGING OF FUEL BURN THROUGHOUT THE FLT. THEY BECAME CONVINCED THAT THEY HAD FUEL INDICATION IRREGULARITIES WHEN THEY COULD NOT MATCH ACFT TRIM TO THE FUEL IMBALANCE THEY OBSERVED ON THE GAUGES; BUT KNOWING THEY HAD SUFFICIENT FUEL THEY CONTINUED ON IN THE BELIEF THAT IF THEY TURNED ALL XFEEDS AND FUEL PUMPS ON THE ENG WOULD CONTINUE TO OPERATED. POST-FLT INSPECTION REVEALED A 10600# FUEL FLOW DIFFERENTIAL BTWN #2 AND #3 MAIN TANKS. ALSO REVEALED WAS THAT THE #2 VALVE MOTOR WOULD NOT OPERATE AT LOW TEMP AND THE #4 XFEED VALVE MOTOR SUFFERED ELECTRICAL PWR LOSS THROUGH THE CANNON PLUG AT LOW TEMPS. USE OF JETTISON SYS WAS NOT INCLUDED IN THE TRNING THE CAPT RECEIVED AND APPARENTLY THE F/O AND S/O; KNOWING THAT A COMPANY BULLETIN HAD BEEN ISSUED RESTRICTING THE USE OF THIS SYS; NEVER DISCUSSED ITS USE. THE FLT CREW IS ON SPECIAL ASSIGNMENT UNTIL THEY REQUALIFY ON THE WDB. A MORE COMPLETE NTSB AND FAA RPT HAS BEEN FILED ALONG WITH A COMPANY RPT.