(2)
AMM 28-11-00/201, Fuel Tanks

 (3)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (4)
AMM 28-26-00/201, Defueling

 B.  
Access

 (1)  
Location Zones 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right

 (2)  
Access Panels
 545AB Fuel Tank Access Door
 546AB Fuel Tank Access Door
 645AB Fuel Tank Access Door
 646AB Fuel Tank Access Door

 C.  
Procedure

 (1)
Defuel the applicable main fuel tank (AMM 28-26-00/201).

 S 654-002
 S 864-017
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND TO GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (2) Purge and prepare to go into the main fuel tank (AMM 28-11-00/201).
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A 747-400 MAINTENANCE MANUAL
 (3)  S 014-004Remove additional fuel tank access doors, if it is necessary, to get access to the valve body (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
 (4)  S 864-005Go into the fuel tank (AMM 28-11-00/201).
 (5)  S 014-006Go to the front spar through the access hole in the midspar.
 (6)  S 034-007Disconnect the couplings (2) that attach the fuel lines to the valve body (1).
 (7)  S 034-018Discard the O-rings (7).
 (8)  S 034-008Remove the mounting bolts (3) and washers (4) (four locations) that attach the valve body (1) to the mounting bracket (6).
 (9)  S 024-009Disengage the valve body (1) from the adapter shaft (5).

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747-400 MAINTENANCE MANUAL
 S 024-019
 (10) Remove the valve body (1).
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A

747-400
MAINTENANCE MANUAL

MIDSPAR 546AB (646AB) 545AB (645AB)
FUEL CROSSFEED VALVE

LEGEND

UNDERWING ACCESS DOOR ACCESS DOOR - MID SPAR ACCESS HOLE
NOTE:  LEFT WING IS SHOWN, RIGHT WING IS OPPOSITE.
Fuel Crossfeed Valve Body Installation
Figure 401 (Sheet 1)

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A
747-400 MAINTENANCE MANUAL
INDEX
MARKS
1. VALVE
BODY

SEE C  2. COUPLING 3. MOUNTING
(2 LOCATIONS)
BOLT (4 LOCATIONS)
4. WASHER (4 LOCATIONS)
A
A
5. ADAPTER PLATE
FRONT SPAR
ELECTRICAL
SURFACE
BOND

FWD 1
5.
 ADAPTER SHAFT

6.
 MOUNTING
　
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