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 C.  The adapter is installed on the rear spar below the transfer valve actuator found inboard of the inboard engine. The adapter plate is installed to the spar from the inner side of the inboard main fuel tank. The shaft extends from the adapter plate into the fuel tank and engages with the transfer valve body.
 TASK 28-16-06-004-001
 2.  Main Tank Transfer Valve Adapter Removal (Fig. 401)________________________________________
 A.  References
 (1)
AIPC 28-16-06 Fig. 1

 (2)
AMM 27-51-00/201, Trailing Edge Flap Systems

 (3)
AMM 28-11-00/201, Fuel Tanks

 (4)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (5)
AMM 28-16-04/401, Main Tank Transfer Valve Actuator

 (6)
AMM 28-26-00/201, Defueling

 B.  
Access

 (1)  
Location Zones 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 573 Rear Spar to Inbd Aileron Leading Edge, Left 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 673 Rear Spar to Inbd Aileron Leading Edge, Right

 (2)  
Access Panels
 545BB Fuel Tank Access Panel
 573AB Inbd Aileron Actuator Access Panel
 645BB Fuel Tank Access Panel
 673AB Inbd Aileron Actuator Access Panel

 C.  
Prepare for the Removal

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 28-16-06
 ALL  ú ú 01 Page 401 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-042
 WARNING: MAKE SURE THAT PERSONS AND THE EQUIPMENT ARE CLEAR BEFORE YOU
_______ MOVE THE FLAP CONTROL LEVER. THE LEADING EDGE FLAPS, THE TRAILING EDGE FLAPS AND THE FLAP DRIVE MECHANISMS WILL MOVE. WITH HYDRAULIC POWER REMOVED, ELECTRICAL POWER WILL MOVE THE FLAPS AUTOMATICALLY WHEN YOU MOVE THE FLAP CONTROL LEVEL.
 (1)  Extend the outboard trailing edge flaps (AMM 27-51-00/201).
 S 044-039
 WARNING: DO THE PROCEDURE IN AMM 27-51-00/201 TO DEACTIVATE AND INSTALL
_______ LOCKS ON THE TRAILING EDGE FLAPS. THE TRAILING EDGE FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2) Deactivate the outboard trailing edge flaps (AMM 27-51-00/201).
 S 864-004
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE AN INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
 (3)  
Defuel the necessary inboard and outboard main tanks
 (AMM 28-26-00/201).

 S 014-040

 (4)  
Do this task: Purging and Entry of Main Fuel Tank
 (AMM 28-11-00/201).

 D.
Procedure

 S 014-044
 (1)  Remove the actuator for the transfer valve in the main tank
 (AMM 28-16-04/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-16-06
 ALL  ú ú 01 Page 402 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 014-045
 (2)  
Remove the sealant from around the periphery of the adapter plate and rear spar (if sealant was applied).

 S 864-005

 (3)  
Go into the fuel tank through the access opening for the fuel tank, 545BB or 645BB (AMM 28-11-00/201).

 S 034-006

 (4)  
Remove the bolts and the washers (4 locations) that attach the adapter to the spar.

 S 024-007

 (5)  
Disconnect the adapter plate from the rear spar.

 S 034-018

 (6)  
Disengage the shaft spline from the valve body.

 S 034-019

 (7)  
Remove the shaft through the opening in the spar.

 (a)  
Discard the o-ring.

 S 144-028
 (8)  Remove all of the old sealant from the rear spar around the periphery of the adapter plate (if sealant was applied).
 TASK 28-16-06-404-008
 3. Main Tank Transfer Valve Adapter Installation (Fig. 401)
_____________________________________________
 A. Consumable Materials
　
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