Engine Fuel Feed System Simplified Schematic
Figure 6 (Sheet 3)
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MAINTENANCE MANUAL
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(2) Obtain a direct tank-to-engine fuel flow using main tank boost
(3) pumps. (a) Check that the applicable FUEL CONTROL switch on the control stand is in RUN position. (b) Check that FUEL X FEED switches on the fuel management control module are in closed position (flowbar extinguished). (c) Set MAIN boost pump switches to ON.Obtain fuel crossfeed from any main tank to adjacent engine or engines. (a) Check that applicable FUEL CONTROL switch(es) on the control stand are in RUN position. (b) Set appropriate FUEL X FEED switches to OPEN (flowbar on switch will illuminate), depending on which boost pumps are operating and engine(s) receiving fuel.
NOTE:____ Crossfeed valves for main tanks No. 2 and No. 3 will not
open if airplane is on the ground with flaps extended.
(4) (c) Set MAIN boost pump switches to ON.Obtain fuel from the center wing tank for engine fuel feed. (a) Check that applicable FUEL CONTROL switch(es) on the control stand are in RUN position. (b) Set appropriate FUEL X FEED switch(es) in open position (flowbar will illuminate) for fuel flow to desired engine(s).
NOTE:____ Crossfeed valves for main tanks No. 2 and No. 3 will not
open if airplane is on the ground with flaps extended.
(5) (6) (c) Set CTR override/jettison pump switches to ON.Set boost pump and override/jettison pump switches to OFF to terminate engine fuel feed system operation.Set FUEL CONTROL switch(es) to CUTOFF.
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FLOW BAR SHOWS FUEL FLOW
FLOW BAR SHOWS THAT THE VALVE IS OPEN
FLOW BAR SHOWS THAT THE PUMP IS ON AND THERE IS FUEL FLOW
E45457
Figure 7
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747-400 FAULT ISOLATION/MAINT MANUAL
ENGINE FUEL FEED SYSTEM
COMPONENT SHT 102 FIG. QTY ACCESS/AREA REFERENCE
ACTUATOR - VALVE, NO. 1 ENGINE FUEL SHUTOFF, 1 1 521EB, L LEADING EDGE TO FRONT 28-22-01
V13 SPAR
ACTUATOR - VALVE, NO. 1 FUEL CROSSFEED, V45 1 1 L LEADING EDGE TO FRONT SPAR 28-22-02
ACTUATOR - VALVE, NO. 2 ENGINE FUEL SHUTOFF, 1 1 L LEADING EDGE TO FRONT SPAR 28-22-01
V14
ACTUATOR - VALVE, NO. 2 FUEL CROSSFEED, V46 1 1 L LEADING EDGE TO FRONT SPAR 28-22-02
ACTUATOR - VALVE, NO. 3 ENGINE FUEL SHUTOFF, 1 1 R LEADING EDGE TO FRONT SPAR 28-22-01
V15
ACTUATOR - VALVE, NO. 3 FUEL CROSSFEED, V47 1 1 R LEADING EDGE TO FRONT SPAR 28-22-02
ACTUATOR - VALVE, NO. 4 ENGINE FUEL SHUTOFF, 1 1 621EB, R LEADING EDGE TO FRONT 28-22-01
V16 SPAR
ACTUATOR - VALVE, NO. 4 FUEL CROSSFEED, V48 1 1 R LEADING EDGE TO FRONT SPAR 28-22-02
ADAPTER - VALVE, NO. 1 ENGINE FUEL SHUTOFF 1 1 LEADING EDGE TO FRONT SPAR OUTBD MAIN TANK, 521EB, L 552EB, L FRONT SPAR TO MID SPAR 28-22-09
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