(2)  
IPC 57-31-79 Fig. 1

 B.
Access

 (1)  
Location Zones
 131 Center Section Wing Box, Left
 132 Center Section Wing Box, Right

 (2)  
Access Panel
 131EZ Center Wing Tank Access Door

 C.
Procedure

 S 424-008
 (1)  
Put the access door into its position.

 S 434-009

 (2)  
Install the bolts and the washers (12 locations, spanwise beam No. 1; 20 locations, midspar and spanwise beams No. 2 and No. 3).

 (3)  
Get out of the center wing tank.

 (4)  
Close the center wing tank (Ref 28-11-00/201).

 S 414-010
 S 414-011
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-09
 ALL  ú ú 01 Page 402 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SPANWISE BEAM NO. 1 ACCESS DOOR 131DZ, 132BZ
SEE B
MIDSPAR ACCESS DOOR 131CZ, 132AZ
SEE A
SPANWISE BEAM 
CENTER WING TANK ACCESS  NO. 3 ACCESS 
DOOR 131EZ, 132CZ  DOOR 131AZ  SPANWISE BEAM 
(AMM 28-11-01)  SEE  A  NO. 2 ACCESS 
DOOR 131BZ 
SEE  A 

NUTPLATE ACCESS ACCESSDOOR DOOR
NUTPLATE DOOR HANDLE
BOLT, WASHER
BOLT, (12 LOCATIONS)WASHER (20 LOCATIONS) FWD
ACCESS DOOR SPANWISE BEAM NO. 1 ACCESS DOOR
(EXAMPLE) A
B
NOTES:THE 131 NUMBER SERIES ARE USED WITH THE LEFT WING.
THE 132 NUMBER SERIES ARE USED WITH THE RIGHT WING.
Spanwise Beam Access Door Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-09
 ALL  ú ú 01 Page 403 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FUEL SUMP DRAIN VALVE - REMOVAL/INSTALLATION
____________________________________________
 1.  General_______
 A.  This procedure supplies instructions to remove and install the fuel sump drain valve from the wing fuel tanks, the center wing tank, and the surge tanks.
 B.  The sump drain valves in the inboard main tanks, the center wing tank, and all the surge tanks are found at the low point of the tank. The sump drain valves for the outboard main tanks are found in the inboard main tanks, with a drain hose that goes from the outboard main tank. The sump drain valves for the reserve tanks are found in the outboard main tanks, with a drain hose that goes from the reserve tank.
 C.  The access to the sump drain valves is through the access doors for the applicable fuel tank.
 TASK 28-11-10-004-001
 2.  Fuel Sump Drain Valve Removal (Fig. 401)_____________________________
 A.  References
 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-11-00/801, Fuel Tanks

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

 (4)
AMM 28-11-04/401, Fuel Sump Drain Valve Primary Poppet

 (5)
AMM 28-11-09/401, Spanwise Beam Access Door

 (6)
AMM 28-26-00/201, Defueling

 (7)
AIPC 28-11-04, Fig. 1

 (8)
AIPC 28-11-07, Fig. 1

 B.  
Access

 (1)  
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 555 Surge Tank, Front Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 655 Surge Tank, Front Spar to Rear Spar, Right

 (2)  
Access Panels
 131AZ Spanwise Beam Access Door
 544AB Fuel Tank Access Door
 545BB Fuel Tank Access Door
 552DB Fuel Tank Access Door
 644AB Fuel Tank Access Door
 645BB Fuel Tank Access Door
　
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