(d)  
If the CENTER PRESELECT indicator is blank, move the SET QTY switch to the CTR position again.

 NOTE: A fuel quantity value will be set into the indicator.
____
 S 653-022
 (2)  Makes sure the P42 panel is set for the refuel operation:
 (a)  
VALVE POSITION CONTROL switches - CLOSED

 (b)  
ALL VALVES switch - CLOSED

 (c)  
SELECT QTY thumbwheel - set to CWT preselect value

 (d)  
CENTER PRESELECT indicator - same as SELECT QTY thumbwheel value

 (e)  
TOTAL FUEL PRESELECT indicator - blank

 I. Begin the Refuel Operation
 S 653-023
 (1)  
Put the ALL VALVES switch to the OPEN position.

 S 653-024

 (2)  
Activate the fuel shutoff control switch (deadman switch) to start the fuel flow.

 (3)  
Make sure the refuel pressure is between 35 and 55 psi.

 S 653-026

 (4)  
Make sure the CENTER L and R refuel valve indication lights come on (valves open).

 S 653-025
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747-400 MAINTENANCE MANUAL
 S 653-027
 (5)  
The FQPU will automatically control the distribution of the fuel load.

 S 653-028

 (6)  
Push the TEST SYS switch for a minimum of 2 seconds and then release the switch.

 NOTE: When you press the TEST SYS switch, the FQPU momentarily
____ closes the refuel valves to check for FQPU valve shutoff control.
 (a)  
The refuel valve lights will go out and then come on again.

 (b)  
The refuel operation will continue.

 S 653-029
 (7)  Monitor the CENTER fuel quantity indicator and refuel valve
 indication lights.

 J. Stop the Refuel Operation
 S 653-030
 (1)  Put the ALL VALVES switch to the CLOSED position when all of the refuel valve position lights are off.
 NOTE: The FQPU will automatically close the CWT refuel valve(s)
____ when the tank fuel quantity is at VTO or the preselect CWT value.
 S 653-031
 (2)  
Release the deadman switch to stop the fuel flow.

 (3)  
Wait one minute to let the FQIS system stabilize.

 (4)  
Record the actual fuel quantities from the fuel quantity indicators.

 (5)
Record the actual fuel quantity from the fuel vehicle flow meter.

 S 653-032
 S 653-033
 S 653-034
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747-400 MAINTENANCE MANUAL
 S 653-035
 (6)  Do the discrepancy check and make sure it is within limits.
 NOTE: Per operator's requirements.
____
 S 653-036
 (7)  
Complete the Fuel Sheet.

 S 653-037

 (8)  
Complete the Delivery Receipt, if necessary.

 S 653-038

 (9)  
Give a copy of the forms to the airline representative or flight crew.

 K. Put the Airplane Back to the Usual Condition
 S 653-039
 (1)  
Put the manual handle for the FUELING SHUTOFF VALVE to the CLOSED position (left and right wing).

 S 653-040

 (2)
Make sure all the P42 panel switches are in the CLOSED position.

 S 653-041

 (3)  
Put the POWER switch to the NORM position (if necessary).

 S 653-042

 (4)  
If the airplane battery power was used, set the BATTERY switch to the OFF position.

 S 653-043

 (5)  
Disconnect the refuel nozzle from the airplane.

 (6)  
Remove the refuel nozzle bonding cable (if installed).

 S 653-045

 (7)  
Make sure the defuel lever is correctly positioned in the recess for the refuel receptacle adapter.
　
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