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 (1)  Extend the leading edge flaps (AMM 27-81-00/201).
 S 484-031
 WARNING:_______DO THE PROCEDURE IN AMM 27-81-00/201 TO INSTALL THE LOCKS. THE FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this task: Extended Leading Edge Flaps Deactivation and Safety Locks Installation (AMM 27-81-00/201).
 S 654-032
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (3)  
Defuel the applicable main fuel tank (AMM 28-26-00/201).

 S 654-047

 (4)
Purge and prepare to go into the main fuel tank (AMM 28-11-00/201).

 D.
Procedure

 (1)  
Remove the fuel crossfeed valve actuator (AMM 28-22-02/401).

 S 074-034

 (2)  
Remove the sealant from around the periphery of the adapter plate and front spar (if sealant was applied) (View A).

 S 024-033
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A
747-400 MAINTENANCE MANUAL
 S 014-005
 (3)  Remove additional fuel tank access doors, if it is necessary, to get access to bolts for the adapter (AMM 28-11-02/401).
 NOTE: Refer to this table for access.
____
 ~................................................................. | | | | Location | Access Door | | | | ................................................................... | No. 1 Main Tank | 546AB | | No. 2 Main Tank | 545AB | | No. 3 Main Tank | 645AB | | No. 4 Main Tank | 646AB | 2......................................…..........................1
 S 864-006
 (4)  
Go into the fuel tank (AMM 28-11-00/201).

 S 024-046

 (5)  
Do these steps to remove the adapter plate (1):

 (a)  
Remove the bolts (7) and washers (8) (four locations) in the tank that attach the adapter plate (1) to the front spar.

 (b)  
Move the adapter (1) away from the front spar to disengage the shaft (1) from the valve body.

 (c)  
Remove the shaft (1) through the opening in the front spar.

 (d)  
Discard the O-ring (6).

 TASK 28-22-11-404-010
 3.  Fuel Crossfeed Valve Adapter Installation (Fig. 401)_________________________________________
 A. References
 (1)  AIPC 28-22-11 Fig. 1
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747-400 MAINTENANCE MANUAL
FUEL CROSSFEED VALVE
SEE A
1. ADAPTER PLATE
SEE B
2. INDEX
PLATE

ACTUATOR
FRONT FWDSPAR FILLET SEAL 1
FUEL CROSSFEED VALVE A
APPLY A FILLET SEAL OF BMS 5-95 SEALANT TO THE EDGE OF THE ADAPTER PLATE AND FRONT SPAR (ELECTRICAL BOND PROTECTIVE SEAL) (SWPM 20-20-00) ON AIRPLANES WITHOUT PRIMER BETWEEN FRONT SPAR AND ADAPTER PLATE.
1
PREPARE THE FAYING SURFACES OF THE ADAPTER PLATE AND MATING SURFACE OF THE FRONT SPAR FOR AN ELECTRICAL SURFACE BOND (SWPM 20-20-00) ON AIRPLANES WITHOUT PRIMER BETWEEN FRONT SPAR AND ADAPTER PLATE.
2
Fuel Crossfeed Valve Adapter Figure 401 (Sheet 1)
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MAINTENANCE MANUAL

4. SCREW
3. WASHER  (2 LOCATIONS) (3 LOCATIONS)
2. INDEX PLATE
1. ADAPTER PLATE
FAYING SURFACE 2 5. SCREW
FRONT
SPAR

8. WASHER
(4 LOCATIONS)

7. BOLT (4 LOCATIONS)
FWD
INDEX MARKS SEE C
　
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