(a)  
95% VTO Shutoff

 (b)  
87% VTO Shutoff

 (3)  
The early shutoff set value depends on the which FQIS components are inoperative.

 (4)  
Troubleshooting for this condition is given in this FIM procedure:

 (a)  Fuel Quantity Less than Expected (Early Shutoff) (FIM 28-21-00/101).
 B. References
 (1)  
AMM 12-11-01/301, Fuel Servicing

 (2)  
AMM 28-26-00/201, Defuel

 (3)  
FIM 28-21-00/101, Refuel

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MAINTENANCE MANUAL

 C. Access
 (1)  
Location Zones
 500 Left Wing
 600 Right Wing

 (2)  
Access Panel
 521CB Fueling Control Panel Access Door

 D. Airplane Precautions
 S 653-075
 WARNING: OBEY ALL THE FUEL SERVICING AND MANUAL PRESSURE REFUEL
_______ PRECAUTIONS IN AMM 12-11-01/301. FAILURE TO OBEY THE PRECAUTIONS CAN CAUSE SERIOUS INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  Read and obey the precautions in this task: Precautions and Limits for Fuel Servicing (AMM 12-11-01/301).
 E. Refuel Operation When an Early Fuel Shutoff Occurs
 S 653-076
 (1)  
Complete the automatic or manual refuel operation.

 S 653-077

 (2)  
Wait for one minute to let the FQIS system stabilize.

 S 653-078

 (3)  
Find out which tank shutoff prior to the VTO.

 S 653-079
 WARNING: IF A REFUEL VALVE CLOSES EARLY, DO NOT CONTINUE TO REFUEL THE
_______ TANK WITH THE VTO SWITCH IN THE OVERRIDE POSITION. AN OVERFILL CONDITION AND POSSIBLE OVERBOARD FUEL SPILL CAN OCCUR. A FUEL SPILL CAN CAUSE A FIRE OR EXPLOSION.
 (4)  
Do not put the VTO switch to the override position to add more fuel into the fuel tank.

 (5)  
Do not use the fuel quantity indication value for that tank.

 S 653-082

 (6)  
Use this procedure to continue to fill the tank:

 S 653-080
 (a)  Refuel Operation - Blank Fuel Quantity Indicator
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 (7)  S 653-083Use the fuel measuring stick value as the fuel sheet fuel quantity.
 (8)  S 653-084Transfer fuel as necessary to get the fuel distributed per fuel sheet requirements (AMM 28-26-00/201).
 (9)  S 653-085Make a logbook entry of the early shutoff condition.
 S 813-086

 (10) Troubleshoot the refuel system to find and repair the cause of the early shutoff condition (FIM 28-21-00/101).
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747-400 MAINTENANCE MANUAL
 FUEL TANK SUMPING - SERVICING
_____________________________
 1.  General_______
 A. This procedure contains these tasks:
 (1)  
Wing Tank Fuel Sumping Procedure

 (2)  
Drain the Surge Tank With the Surge Tank Drain Fitting

 B. This procedure contains this task:
 (1)  Wing Tank Fuel Sumping Procedure
 C. Fuel System Drainage
 (1)  
There is one sump drain valve installed in each of the fuel tanks including the surge tanks. The sump inlet is at the lowest area of the fuel tank where water and sediment will collect.

 (2)  
You can use the sump drain to accomplish these actions:
　
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