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 C.  The pressure fueling operation is controlled at the refueling control panel at the left wing fueling station. The panel contains switches and indicator lights, to control and monitor the positions of the system components. The panel also provides a means to pre-select the desired fuel quantity to be onboard when pressure fueling operation is complete. A proximity switch, actuated by the panel access door, cuts off all power to the panel when the panel access door is closed.
 D.  If fuel overflows into the wing surge tank due to fuel quantity processor malfunction, the pressure fueling operation will terminate automatically.
 2.  Fueling Receptacle (Fig. 1)__________________
 A.  The fueling receptacles provide a means of connecting ground refueling hose nozzles to the pressure fueling system.
 B.  Two receptacles at each fueling station are mounted on the forward face of the front spar. Each receptacle consists of a fueling nozzle adapter, a cast aluminum elbow, a cap, a spring-loaded check valve, and a manual shutoff valve attached to the spar and connected to the manifold. The fueling nozzle adapter has mating lugs to couple with and secure a fueling hose. When not in use, the receptacles are covered and sealed by the cap which engages the lugs on the hose nozzle adapter. Each cap is secured to its respective adapter by a chain.
 C.  A defuel lever is located on the refuel receptacle adapter. The defuel lever is marked LIFT TO DEFUEL. After each refuel or defuel operation, make sure the defuel lever is stowed correctly in the recess on the refuel receptacle adapter.
 D.  When a hose is coupled to the refuel receptacle adapter, the spring-loaded check valve is lifted to a position that allows the hose nozzle to lock in place. During pressure fueling, the check valve opens only when nozzle fuel pressure is greater than receptacle manifold pressure. For defueling, the check valve is held open by the nozzle after the defuel lever on the refuel receptacle adapter is lifted out of the recess and put in the fully extended position. The outboard receptacle at each fueling station includes a port that connects to a line from the defueling valve located between the receptacles.
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747-400
MAINTENANCE MANUAL

 

MANIFOLD DRAIN VALVE SEE
D
FUELING/JETTISON MANIFOLD
LEFT WING SHOWN, SURGE TANK RIGHT WING EQUIVALENT. FLOAT SWITCH
SEE

Pressure Fueling System - Component Location
Figure 1 (Sheet 1)

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747-400 MAINTENANCE MANUAL
SWITCH LEADS
MAGNETIC ACTUATOR  FUELING CONTROL (SHOWN CLOSED) PANEL DOOR 
FUELING POWER CONTROL SWITCH 

FWD
MANUAL DEFUEL VALVE HANDLE FUELING
DEFUELING LINE RECEPTACLE
B
FUELING RECEPTACLE
MANUAL SHUTOFF VALVE HANDLE
FWD
OUTBD
FUELING CROSSOVER MANIFOLD
FUELING/
JETTISON

MANIFOLD  C
MANIFOLD
DRAIN VALVE

D
Pressure Fueling System Component Location
Figure 1 (Sheet 2)

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747-400
MAINTENANCE MANUAL

REFUEL VALVE UNIT  FWD  INBD 
REFUEL VALVE CONTROL UNIT 
OVERRIDE SCREW  ELECTRICAL CONNECTOR  REFUEL VALVE UNIT  REFUEL VALVE CONTROL UNIT 
(DRY SIDE) E  FUELING/ JETTISON MANIFOLD 
ELECTRICAL CONNECTOR  FRONT SPAR  FLOAT SWITCH  DISTRIBUTION MANIFOLD FUELING  (WET SIDE) E  FWD INBD 
INBD 
FWD  F 
Figure 1 (Sheet 3) Pressure Fueling System Component Location 
　
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