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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 654-002
 (1)  Defuel the applicable fuel tank (AMM 28-26-00/201).
 NOTE: It is usually necessary to replace the O-ring in the
____ primary poppet of the sump drain valve for leakage. You can do this with fuel in the fuel tanks.
 S 864-003
 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 surge tank (AMM 28-11-00/201).

 S 014-004

 (3)  
Remove the other tank access doors, if it is necessary, to get the access to the fuel sump drain valve (AMM 28-11-02/401).

 NOTE: Refer to this table for access door locations.
____
 ~.................................................................. | Tank | Access Door | .................................................................... | No. 1 Main Tank | 545BB | | No. 2 Main Tank | 544AB | | No. 3 Main Tank | 644AB | | No. 4 Main Tank | 645BB | | No. 2 Reserve Tank | 552DB | | No. 3 Reserve Tank | 652DB | | Center Wing Tank | 131EZ | | Wing Surge Tank - Left | 555AB | | Wing Surge Tank - Right | 655AB | 2.....................................…............................1
 S 864-005
 (4)  
Go into the fuel tank (AMM 28-11-00/201).

 S 014-006

 (5)  
If you replace the fuel sump drain valve in the center wing tank, remove the access door 131AZ for the spanwise beam No. 3 (AMM 28-11-09/401).

 S 034-007

 (6)
On the fuel sump drain valve with the drain line, disconnect the drain line coupling from the fitting on the valve housing.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 034-008
 (7)  
On the fuel sump drain valve with the drain line, remove the fitting from the valve housing.

 S 034-044

 (8)  
Discard the packing.

 S 144-009

 (9)  
Remove the sealant from the valve base and the nuts
 (AMM 28-11-00/801).

 S 034-010
 CAUTION:_______DO NOT REMOVE THE BOLTS FROM THE WING LOWER PANEL. YOU CAN CAUSE A FUEL LEAK AND EXTRA MAINTENANCE IF YOU REMOVE THE BOLTS.
 (10)
 Remove the nuts and the washers (2 locations) that attach the fuel sump drain valve to the mounting bolts.

 S 024-011

 (11)
 Remove the fuel sump drain valve.

 NOTE: The valves in the surge tanks are installed on the
____ spacers. If you remove the spacer, keep it for the installation.
 TASK 28-11-10-404-012
 3.  Fuel Sump Drain Valve Installation (Fig. 401)__________________________________
 A. Consumable Materials
 (1)  Solvent
 NOTE: Use one of these:
____
 (a)  
B00148 Methyl Ethyl Ketone (MEK), TT-M-261

 (b)  
B00184 BMS 11-7

 (2)  
Sealant

 NOTE: Use one of these:
____
 (a)  A00000 Proseal 860, Class B-1/6
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 ALL  ú ú 04 Page 403 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

NO. 3 RESERVE TANK SUMP DRAIN
SEE B
NO. 3 MAIN TANK SUMP DRAIN
SEE A
CENTER WING TANK SUMP DRAIN
SEE A
A
SEALANT
　
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