747-400 AMM 飞机维护手册 燃油 FUEL 3(131)

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 3.  Fuel Jettison Nozzle (Fig. 1)
____________________
 A.  The fuel jettison nozzle in the fuel jettison system discharges fuel at the wingtips of the airplane. The fuel jettison nozzle is a 3-inch diameter fiberglass tube extending approximately 4 inches past the trailing edge of the wing.
 4.  Fuel Jettison Nozzle Valve (Fig. 1)
__________________________
 A.  Two fuel jettison nozzle valves supply a means of controlling the fuel flow to the fuel jettison nozzles. The fuel jettison nozzle valves are found in the fuel jettison manifold in the wingtips, outboard of the surge tanks. The valve assembly has two separate subassemblies, a valve and an electric actuator.
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A
747-400
MAINTENANCE MANUAL

FUEL JETTISON NOZZLE VALVE
WING TANK COMPONENTS SEE C
SEE A CENTER WING TANK COMPONENTS
SEE B FUEL JETTISON NOZZLE VALVE
SEE C
TO THE CENTER WING TANK
WING TANK
COMPONENTS

SEE A
INLET
HOUSING
FOR THEFWD OVERRIDE/INBD JETTISON PUMP
PRESSURE SWITCH
INLET MOTOR/IMPELLERFUEL HOUSING UNIT FOR THE
JETTISON  FOR THE OVERRIDE/JETTISON PUMPMANIFOLD OVERRIDE/ JETTISONPUMP
MOTOR/IMPELLER UNIT FOR THE OVERRIDE/JETTISON PUMP
TO THE FUEL ACTUATOR FOR THEJETTISON NOZZLE
FUEL  JETTISON TRANSFER(WINGTIP)
REAR SPAR
TRANSFER

JETTISON  VALVE
ADAPTER FOR THEVALVE JETTISON TRANSFERBODY
VALVE WING TANK COMPONENTS (LEFT WING SHOWN, RIGHT WING OPPOSITE)
A

Fuel Jettison System - Component Location
Figure 1 (Sheet 1)

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747-400
MAINTENANCE MANUAL

FROM THE INBOARD 
JETTISON PUMPS MAIN TANK OVERRIDE/  TO THE FUEL JETTISON NOZZLE 
FUEL JETTISON  (WINGTIP) 
MANIFOLD 
FUEL 
JETTISON 
TRANSFER 
VALVE BODY  ACTUATOR FOR THE 
FUEL JETTISON 
TRANSFER VALVE 
ENGINE FUEL 
FEED MANIFOLD 

INLET
REAR SPAR
PUMP
REPRIME
LINE

MOTOR/IMPELLER UNIT FOR THE OVERRIDE/JETTISON
CENTER WING TANK COMPONENTS
(RIGHT SIDE SHOWN, LEFT SIDE OPPOSITE)

B

FUEL JETTISON NOZZLE VALVE
WING
SURGE
TANK

ACTUATOR FOR THE FUEL JETTISON NOZZLE VALVE FUEL JETTISONINBD NOZZLE
FUEL JETTISON
MANIFOLD

FUEL JETTISON NOZZLE VALVE
FWD
(RIGHT SIDE SHOWN, LEFT SIDE OPPOSITE)
C
Fuel Jettison System - Component Location
Figure 1 (Sheet 2)

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747-400
MAINTENANCE MANUAL

4
ON
w
PRESS
a
ON
w
PRESS
a
MAIN TANK OVERRIDE/JETTISON PUMP SWITCHES
FUEL JETTISON CONTROL SELECTOR SWITCH
FUEL TO REMAIN KNOB

SWITCHES
Fuel Jettison System Component Location Figure 1 (Sheet 3)

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747-400
MAINTENANCE MANUAL

 B.  The actuator has a dc electric motor, gear train, limit switches, and a manual override lever, which also serves as a position indicator for the valve. The actuator is readily replaceable without disturbing the valve body installation.
　
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