DISCHARGE CHECK VALVE MAIN TANK FORWARD)
FOR THE OVERRIDE/
JETTISON PUMP (NO. 2 OR FUEL JETTISON
NO. 3 MAIN TANK AFT) TRANSFER VALVE BODY (NO. 2 OR NO. 3 MAIN TANK) HOUSING FOR THE OVERRIDE/ FWD JETTISON PUMP (NO. 2 OR INBD
NO. 3 MAIN TANK AFT)
MOTOR/IMPELLER UNIT FOR THE OVERRIDE/JETTISON PUMP (NO. 2 OR NO. 3
HOUSING FOR THE OVERRIDE/ MAIN TANK AFT), M223 FUEL
JETTISON PUMP (NO. 2 OR OR M226 JETTISON
NO. 3 MAIN TANK FORWARD) MANIFOLD
MOTOR/IMPELLER UNIT FOR THE OVERRIDE/JETTISON PUMP (NO. 2 OR NO. 3 MAIN
TO THE FUEL TANK FORWARD), M222 OR M227
JETTISON
ACTUATOR FOR THE FUEL
NOZZLE (WINGTIP)
JETTISON TRANSFER VALVE
REAR SPAR
ADAPTER FOR THE FUEL  (NO. 2 OR NO. 3 MAIN TANK),
(REF)
JETTISON TRANSFER VALVE V442 OR V443
(NO. 2 OR NO. 3 MAIN TANK)

LEFT OR RIGHT WING TANK COMPONENTS (LEFT SHOWN, RIGHT OPPOSITE)
A
Fuel Jettison System - Component Location
Figure 102 (Sheet 1)

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A
747-400
FAULT ISOLATION/MAINT MANUAL

FROM THE INBOARD  TO THE FUEL JETTISON
MAIN TANK (REF)  NOZZLE (WINGTIP) (REF)
JETTISON INTERCONNECT LINE
FUEL JETTISON TRANSFER REFUEL/JETTISON
VALVE (LEFT OR RIGHT MANIFOLD
CENTER WING TANK)
ENGINE
FUEL FEED

ACTUATOR FOR THE FUEL MANIFOLD
JETTISON TRANSFER VALVE (LEFT OR RIGHT CENTER WING TANK), V53 OR V52
DISCHARGE CHECK VALVE FOR THE INLET
OVERRIDE/JETTISON PUMP (LEFT (REF)
OR RIGHT CENTER WING TANK)
PRIME REPRIME
LINE (REF)

INLET CHECK VALVE FOR
THE OVERRIDE/JETTISON
PUMP (LEFT OR RIGHT
CENTER WING TANK)

MOTOR/IMPELLER UNIT FOR THEPUMP HOUSING FOR THE OVERRIDE/JETTISON PUMP (LEFTOVERRIDE/JETTISON PUMP OR RIGHT CENTER WING TANK),(LEFT OR RIGHT CENTER M224 OR M225WING TANK)
LEFT OR RIGHT CENTER WING TANK COMPONENTS
B
LEFT OR RIGHT
FUEL JETTISON
NOZZLE VALVE

WING SURGE
TANK (REF)
ACTUATOR FOR THE LEFT OR RIGHT FUEL JETTISON NOZZLE VALVE, V56 OR V49 FUEL JETTISON
FUEL JETTISON NOZZLE (REF)
MANIFOLD
LEFT OR RIGHT FUEL JETTISON NOZZLE VALVE
INBD
AFT (LEFT SHOWN, RIGHT OPPOSITE)

C
Fuel Jettison System - Component Location (Details From Sht 1)
Figure 102 (Sheet 2)

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A
747-400 FAULT ISOLATION/MAINT MANUAL
FUEL MANAGEMENT 
CONTROL MODULE, 
M154  JETTISON MODULE, M7325 
SEE  D  SEE  E 
P6 PANEL 
LEFT CENTER WING TANK 
FLIGHT COMPARTMENT  OVERRIDE/JETTISON  RIGHT CENTER WING TANK 
PUMP SWITCH, S18  OVERRIDE/JETTISON 
PUMP SWITCH, S19 

AFT NO. 3 MAINFORWARD NO. 2 MAIN AFT NO. 2 MAIN FORWARD NO. 3 MAINTANK OVERRIDE/JETTISONTANK OVERRIDE/JETTISON TANK OVERRIDE/JETTISON TANK OVERRIDE/JETTISONPUMP SWITCH, S20PUMP SWITCH, S13 PUMP SWITCH, S17
PUMP SWITCH, S16 FUEL MANAGEMENT CONTROL MODULE, M154
D
FUEL JETTISON CONTROL SELECTOR SWITCH, S10
FUEL TO REMAIN KNOB
LEFT FUEL JETTISON NOZZLE VALVE SWITCH, S8
RIGHT FUEL JETTISON NOZZLE JETTISON MODULE, M7325 VALVE SWITCH, S9
E
Fuel Jettison System - Component Location
Figure 102 (Sheet 3)

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A
747-400 MAINTENANCE MANUAL
 FUEL JETTISON SYSTEM - ADJUSTMENT/TEST
______________________________________
 1.  General_______
 A.  This procedure contains instructions to do an operational test of the fuel jettison system.
　
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