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 9.  Fueling Shutoff Relays
______________________
 A.  The fueling shutoff relay is mounted on the P54 panel. The relay signals the fuel quantity processor unit to remove power from all the refuel valves, causing them to close, when either wing surge tank float switch closes.
 10. Operation (Fig. 4 and 5)
_________
 A.  Functional Description
 (1)  The pressure fueling system provides the option to fill all tanks to capacity, to fill all tanks so that airplane contains a preselected fuel quantity while maintaining proper fuel balance among tanks, or to fill the center wing tank only to a preselected fuel quantity. The system is operative when power is supplied to the refuel valves and the fuel quantity processor unit. In the event of processor or refuel valve failure, the tanks can be refueled by monitoring the fuel measuring sticks and/or manually opening and closing the refuel valves.
 CAUTION: DO NOT USE RECEPTACLE MANUAL SHUTOFF VALVES TO REDUCE OR STOP
_______ FUELING. CLOSING THE MANUAL SHUTOFF VALVES DURING FUELING CAN CAUSE PRESSURE SURGES AND EQUIPMENT DAMAGE.
 (2)  
After removing the caps from the fueling receptacles, the fueling hose nozzles are connected and the manual shutoff valves at each receptacle are opened. The airplane is ready to receive fuel.

 (3)  
Prior to starting the refueling operation, the refuel valve position indicator lights may be checked by press-to-test. The fueling quantity (repeater) indicators may be checked by pressing the TEST GAGES switch. If the indicators are working properly, all segments of indicator displays will illuminate until the switch is released. If a tank has an inoperative indicator, fuel quantity can be measured during the refueling operation by using the fuel measuring sticks.

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 28-21-00
 ALL  ú ú 05 Page 12 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

OVERRIDE/JETTISONPUMP REPRIME LINE
CENTER WING TANK
STATION

FUELING FUELING MANUAL DEFUELING
RECEPTACLES
VALVE (REFER TO
28-26-00)

MANUALSHUTOFF
FUELING/JETTISON MANIFOLDVALVES
NO. 2
MAIN TANK

TO RIGHT WING NO. 2
NO. 1
RESERVE TANK

MAIN TANK
RR
R
R

MANIFOLDDRAIN
REFUEL
R VALVE VALVE
R
REFUEL
VALVE

JETTISON NOZZLE VALVE
(REFER TO 28-31-00)
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 28-21-00
 ALL  ú ú 12 Page 13 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
Pressure Fueling System Flow Diagram
Figure 4

A
747-400
MAINTENANCE MANUAL

 (4)  If not all fuel tanks are to be filled to capacity, the operator can pre-select total fuel quantity to be onboard when pressure fueling operation is complete. The fuel quantity processor unit will determine the fuel quantity required in each tank to achieve proper fuel distribution and lateral balance. Optionally, the operator can pre-select fuel quantity for center wing tank only. Fuel quantity is set into appropriate indicator preselect display using thumbwheels and preselect switch. Preselected fuel quantity will appear on EICAS fuel synoptic. Preselected fuel quantity will be loaded in the following sequence:
 NOTE: Preselecting a fuel quantity between 87,000 pounds and 88,000
____ pounds (39,000 kilograms and 40,000 kilograms) may result in EICAS status message M2/M3 < 3K SIG being displayed 5 minutes after fueling. Similarly, preselecting a fuel quantity of between 174,000 pounds and 176,000 pounds (78,900 kilograms and 79,800 kilograms) may result in EICAS status message M2/M3 < 6K SIG being displayed 60 minutes after fueling. Either message may occur when normal fuel schedule distribution results in a M2/M3 single point sensors disagree condition (one tank sensor covered by fuel, the other tank sensor not covered). Message may be cleared by transfering fuel to ensure M2/M3 single point sensors agree (both wet or both dry).
 (a)  
Load Main 1, Main 2, Main 3 and Main 4 equally until Mains 1 & 4 are full.

 (b)  
Load Main 2 and Main 3 equally until each contains 6500 gallons (24,600 liters).
　
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