S 014-006

 (5)  
If you must remove the valve in the center wing tank, remove the access doors in the spanwise beam (AMM 28-11-09/401).

 (a)  
For the valve on the left side of the tank, remove the access doors 131AZ, 131BZ, and 131CZ.

 (b)  
For the valve on the right side of the tank, remove the access doors 131AZ, 131BZ, 132AZ, and 132BZ.

 S 034-007
 (6)  
Remove the mounting bolts and the washers (2 places) that attach the drain valve to the mounting flange.

 S 024-008

 (7)  
Remove the valve and the gasket from the tank.

 D.
Remove the Fuel Vent Drain Valves From the Surge Tanks

 S 654-017
 (1)  Make sure all of the fuel has drained from the surge tank.
 S 864-018
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
 (2)  
Prepare the surge tank for an entry (AMM 28-11-00/201).

 S 014-018

 (3)  
If it is necessary, remove the other surge tank access door to get to the fuel vent drain valve (AMM 28-11-03/401).

 NOTE: Refer to the table that follows for the access door numbers.
____
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MAINTENANCE MANUAL

 ~................................................................. | SURGE TANK DRAIN VALVES ACCESS | ................................................................... | TANK | VALVE | APPROXIMATE | ACCESS DOOR | | | | WING STATION | | | | | LOCATION | | ................................................................... | SURGE TANK | | W.S. 1494 | 555AB 655AB | | | | | 555BB 655BB | 2..............…..............…...............…...................1
 S 864-019
 (4)  
Go into the surge tank (AMM 28-11-00/201).

 S 034-028

 (5)  
Do these steps to remove the fuel vent drain valve on the vent tube inlet:

 (a)  
Remove the mounting bolts and the washers (2 places) that attach the drain valve to the mounting flange.

 (b)  
Remove the fuel vent drain valve and the gasket from the tank.

 TASK 28-13-01-404-009
 3.  Install the Fuel Vent Drain Valve (Fig. 401)_________________________________
 A. References
 (1)  
AMM 28-00-00/201, Fuel

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
AMM 28-11-09/401, Spanwise Beam Access Door

 (4)  
AIPC 28-13-01 Fig. 1

 B.
Access

 (1)  
Location Zone 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 555 Surge Tank, Front Spar to Rear Spar, Left 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right 655 Surge Tank, front Spar to Rear Spar, Right

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 28-13-01
 ALL  ú ú 06 Page 405 ú Oct 10/97
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747-400
MAINTENANCE MANUAL

FUEL VENT DRAIN VALVE
SEE A
VENT TUBE
VENT TUBE FUEL VENT DRAIN VALVE
FUEL VENT
DRAIN VALVE

SEE A
SEE A
FUEL VENT
DRAIN VALVE

SEE A
VENT TUBE
NOTE:LEFT WING SHOWN; RIGHT WING SIMILAR.
VENT TUBE INLET
SEE B VENT TUBE BOLT
(2 PLACES)
WASHER
(2 PLACES)
MOUNTING
FLANGE
GASKET
DRAIN
VALVE
　
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