(3)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).
S 864-208
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28-31-01
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A
747-400 MAINTENANCE MANUAL
FUEL JETTISON NOZZLE VALVE ASSEMBLY - REMOVAL/INSTALLATION
__________________________________________________________
1. General_______
A. This procedure contains instructions to remove and install the fuel jettison nozzle valve assembly (actuator and valve body). If you replace the actuator only, refer to AMM 28-31-05/401.
B. A fuel jettison nozzle valve assembly is found in each wingtip, immediately outboard of the surge tanks. The valve body is installed in the fuel jettison manifold; the actuator is installed directly on the valve body.
C. Access to the valve assembly is through the access doors 556AB and 656AB.
(1)
Before the nozzle valves are opened, make sure the refuel/jettison manifold is not pressurized. The refuel/jettison manifold is pressurized during a refuel, defuel or fuel transfer operation.
(2)
The time for the manifold drains in the inboard main tanks to remove the pressure from the refuel/jettison manifold is 1.5 hours.
(3)
It is recommended that this procedure be done a minimum of 1.5 hours after a refuel, defuel or transfer operation to make sure there is not pressure in the refuel/jettison manifold.
(4)
As an alternate procedure to quickly remove the pressure from the refuel/jettison manifold, the No. 2 and No. 3 main tank refuel valves can be opened. Make sure the No. 2 and No. 3 main tanks are not full (at VTO) and that the refuel valves operate correctly (the valves open).
(a)
If the No. 2 and No. 3 main tank refuel valves are not used, any refuel valve that operates can be used to remove the pressure from the refuel/jettison manifold.
TASK 28-31-03-004-001
2. Fuel Jettison Nozzle Valve Assembly Removal (Fig. 401)___________________________________________
A. References
(1)
AMM 12-11-01/301, Fuel Tank - Servicing
(2)
AMM 27-81-00/201, Leading Edge Flap System
(3)
AIPC 28-31-05 Fig. 2
(4)
SSM 28-31-03
(5)
WDM 28-31-13
B.
Access
(1)
Location Zones
556 Dry Bay, Front Spar to Rear Spar, Left
656 Dry Bay, Front Spar to Rear Spar, Right
(2)
Access Panels
556AB Wingtip Dry Bay Access Door
656AB Wingtip Dry Bay Access Door
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A
747-400
MAINTENANCE MANUAL
FUEL JETTISON
NOZZLE VALVE
SEE A
FUEL JETTISON
NOZZLE VALVE
SEE A
OUTBOARD RIB
OF SURGE TANK
NOZZLE VALVE
ASSEMBLY
SEE B
REAR SPAR
GASKET SEAL INBD FUEL JETTISON VALVE
MANIFOLD BODY FWD
FUEL JETTISON NOZZLE VALVE
PACKING
WASHER A
(4 LOCATIONS)
SCREW (4 LOCATIONS)
ACTUATOR
WASHER BOLT (6 LOCATIONS) (6 LOCATIONS)
NOZZLE VALVE ASSEMBLY
B
Fuel Jettison Nozzle Valve
Figure 401
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28-31-03
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747-400 MAINTENANCE MANUAL
C. Procedure
S 864-024
(1) Make sure that all boost pump and override/jettison pump switches on the fuel management control module (found on the P5 pilots' overhead panel) are off (word ON is not shown).
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