(b)  
Make sure all the indicator displays show 888.8 for one second and then go off for one second.

 NOTE: The test display will continue to cycle until you
____
 release the switch.

 (c)  
Release the test switch.

 (d)  
Make sure all fuel quantity displays go back to the usual indication.

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747-400 MAINTENANCE MANUAL
 S 653-062
 (6) Makes sure the P42 panel is set for a manual refuel operation:
 (a)  
VALVE POSITION CONTROL switches - CLOSED

 (b)  
ALL VALVES switch - CLOSED

 (c)  
SELECT QTY thumbwheel - no values input

 (d)  
TOTAL PRESELECT indicator- blank

 (e)  
CTR PRESELECT indicator - blank

 G. Prepare the Fuel Sheet
 S 653-063
 (1)  
Record the pre-uplift fuel quantity for each tank.

 S 653-064

 (2)  
Calculate the fuel to be uplifted converted to volume.

 S 653-065

 (3)  
Record the uplift quantity on the fuel sheet.

 H. Begin the Refuel Operation
 S 653-066
 (1)  
Decide which fuel tanks to refuel.

 S 653-067

 (2)  
Put the VALVE POSITION CONTROL (MANUAL) switches to the OPEN position for all fuel tanks that are to be refueled.

 NOTE: You can put the ALL VALVES switch to the OPEN position if all
____ tanks are to be refueled to VTO. This is the same action as individually opening each refuel valve switch.
 S 653-069
 (3)  Activate the fuel shutoff control switch (deadman switch) to start the fuel flow.
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747-400 MAINTENANCE MANUAL
 S 653-070
 (4)  
Make sure the refuel pressure is between 35 and 55 psi.

 S 653-071

 (5)
Make sure the refuel valve indication lights come on (valves open).

 S 653-072

 (6)  
Make sure the left and right wing fuel tanks refuel at approximately the same rate.

 S 653-073

 (7)  
Monitor the fuel quantity in each tank.

 NOTE: The FQPU will not automatically control the distribution of
____
 the fuel load.

 S 653-074
 (8)  Do these steps to test the FQPU refuel valve shutoff control:
 NOTE: When you press the TEST SYS switch on the P42 panel, the FQPU
____ momentarily closes the refuel valves to check for FQPU valve shutoff control.
 (a)  
Push the TEST SYS switch for a minimum of two seconds and then release the switch.

 (b)  
The refuel valve lights will go out and then come on again.

 (c)  
The refuel operation will continue.

 S 653-076
 (9)  Monitor the fuel quantity indicators and refuel valve indication lights.
 I. Stop the Refuel Operation
 S 653-077
 (1)  Put the individual refuel valve switches to the CLOSED position at the required fuel quantity.
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A
747-400 MAINTENANCE MANUAL
 S 653-078
 (2)  If opened, 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 tank refuel valve(s)
　
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