S 653-018
(1)
Make sure the onboard fuel load is in a valid fuel distribution configuration (equivalent to after a flight operation).
S 653-019
(2)
Do these steps to input the total preselect fuel quantity, on the P42 panel (View B):
(a)
Set the SELECT QTY thumbwheels to the total fuel quantity necessary.
(b)
Move the SET QTY switch to the TOTAL position and release.
(c)
Make sure the TOTAL FUEL PRESELECT indicator value is the same as the SELECT QTY thumbwheel value.
(d)
If the TOTAL FUEL PRESELECT indicator is blank, move the SET QTY switch to the TOTAL position again.
NOTE: A fuel quantity value will be set into the indicator.
____
S 653-020
(3) 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 total preselect value
(d)
TOTAL PRESELECT indicator- same as SELECT QTY thumbwheel value
(e)
CTR PRESELECT indicator - blank
I. Begin the Refuel Operation
S 653-021
(1)
Put the ALL VALVES switch to the OPEN position.
S 653-022
(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.
(4)
Make sure the refuel valve indication lights come on (valves open).
S 653-023
S 653-024
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747-400
MAINTENANCE MANUAL
S 653-025
(5)
Make sure the left and right wing fuel tanks refuel at approximately the same rate.
S 653-026
(6)
The FQPU will automatically control the distribution of the fuel load.
S 653-027
(7)
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 653-028
(8) Monitor the fuel quantity indicators and refuel valve indication lights.
J. Stop the Refuel Operation
S 653-029
(1) Release the deadman switch to stop the fuel flow when all of the refuel valve position lights are off.
NOTE: The FQPU will automatically close the tank refuel valve(s)
____ when the tank fuel quantity is at VTO or the preselect value.
S 653-030
(2)
Put the ALL VALVES switch to the CLOSED position.
S 653-031
(3)
Make sure the onboard fuel load is in a valid pre-flight fuel distribution.
S 653-032
(4)
Transfer fuel to balance the fuel load if necessary
(AMM 28-26-00/201).
(5)
Wait one minute to let the FQIS system stabilize.
S 653-033
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747-400 MAINTENANCE MANUAL
S 653-034
(6)
Record the actual fuel quantities from the fuel quantity indicators.
S 653-035
(7)
Record the actual fuel quantity from the fuel vehicle flow meter.
S 653-036
(8)
Do the discrepancy check and make sure it is within limits.
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