747-400 AMM 飞机维护手册 燃油 FUEL 4(49)

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 C.  The access to the actuator 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 28-31-05-004-001
 2.  Fuel Jettison Nozzle Valve Actuator 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

 C.  
Procedure

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

ACTUATOR OF THE FUEL 
JETTISON NOZZLE VALVE 
SEE  A 
ACTUATOR OF THE FUEL 
JETTISON NOZZLE VALVE 
SEE  A 
OUTBOARD RIB 
OF THE SURGE TANK 

ACTUATOR SEE B
FUEL JETTISON REARMANIFOLD INBDSPAR
ACTUATOR OF THE FUEL
FWD
JETTISON NOZZLE VALVE A
WASHER
(4 LOCATIONS)

SCREW
(4 LOCATIONS)
VALVE
BODY

ELECTRICAL
ACTUATOR
CONNECTOR
B
ACTUATOR
Fuel Jettison Nozzle Valve Actuator
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-024
 WARNING: MAKE SURE THESE CIRCUIT BREAKERS ARE OPEN AND YOU ATTACH THE
_______ DO-NOT-CLOSE TAGS. IF YOU DO NOT OPEN THE CIRCUIT BREAKERS, YOU CAN CAUSE FUEL TO FLOW TO THE GROUND.
 (1)  
Open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
On the main power distribution panel, P6:
 1) 6D18, JTSN NOZZLE VLV CONT L
 2) 6C18, JTSN NOZZLE VLV CONT R

 (b)  
On the left power distribution center, P414:
 1) 414C5, FUEL OVRD/JTSN PUMP FWD 3
 2) 414C2, FUEL OVRD/JTSN PUMP FWD 2
 3) 414D2, OVRD/JTSN PUMP CTR L

 (c)  
On the right power distribution center, P415:
 1) 415A38, FUEL OVRD/JTSN PUMP AFT 2
 2) 415B38, FUEL OVRD/JTSN PUMP AFT 3
 3) 415M32, OVRD/JTSN PUMP CTR R

 

 S 864-025
 CAUTION: MAKE SURE THE CONTROL SELECTOR SWITCH FOR FUEL JETTISON IS IN
_______ THE OFF POSITION. IF YOU DO NOT SET THE CONTROL SELECTOR SWITCH TO THE OFF POSITION, YOU CAN CAUSE THE FUEL TO FLOW TO THE GROUND.
 (2)  Make sure the FUEL JETTISON control selector switch, installed on the P5 pilots' overhead panel, is in the OFF position.
 S 864-049
 WARNING: MAKE SURE THE TWO DEFUEL VALVE HANDLES AND THE TWO MANUAL
　
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