(2)  
WDM 28-11-16

 B.
Access

 (1)  
Location Zone 573 Rear Spar to Inbd Aileron Leading Edge, Left 673 Rear Spar to Inbd Aileron Leading Edge, Right

 (2)  
Access Panel
 573AT Access Panel
 673AT Access Panel

 C.
Do a Test for the Operation of Main Tank Transfer Valve

 S 864-031
 (1) Apply the electrical power, if not applied (AMM 24-22-00/201).
 S 494-032
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  If not accomplished previously, do this task: Trailing Edge Flaps Deactivation (AMM 27-51-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 405 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-029
 (3)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  
On the overhead circuit breaker panel, P7:
 1) 7H21, FUEL XFR VALVE MAIN 1
 2) 7H24, FUEL XFR VALVE MAIN 4

 S 714-019
 (4)  
Set the FUEL XFER MAIN 1&4 switch, on the pilots' overhead panel, P5, to the ON position.

 S 864-024

 (5)  
Make sure the manual override lever on the actuator is in the open position.

 S 864-020

 (6)  
Set the FUEL XFER MAIN 1&4 switch to the OFF position.

 D.
Put the Airplane Back to Its Usual Condition.

 S 414-021
 (1)  
Close the applicable access panel 573AT or 673AT.

 S 864-022

 (2)  
Remove the electrical power, if it is not necessary for a subsequent task (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-16-04
 ALL  ú ú 01 Page 406 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MAIN TANK TRANSFER VALVE BODY - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  This procedure contains instructions for the removal and installation of the valve body for the transfer valve assembly in the main tank.
 B.  The transfer valve body is found at the aft outboard corner of the inboard main tank.
 C.  You can get access to the valve body through an access door installed in the outer bottom surface of the inboard main tank.
 TASK 28-16-05-004-001
 2.  Main Tank Transfer Valve Body Removal (Fig. 401)_____________________________________
 A.  References
 (1)  
AIPC 28-16-05, Fig. 1

 (2)  
AMM 28-11-00/201, Fuel Tanks

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

 (4)  
AMM 28-26-00/201, Defueling

 B.  
Access

 (1)  
Location Zones 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right

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

 C.  
Procedure

 S 654-002
 (1)  Defuel the inboard and the outboard main fuel tanks (AMM 28-26-00/201).
 S 864-003
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE AN INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
 (2)  
Do the Purge and Entry of the Main Fuel Tanks task
　
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