SUMP DRAIN (EXAMPLE)
A
SURGE TANK SUMP DRAIN SEE A
NO. 4 MAIN TANK SUMP DRAIN
SEE B
SURGE TANK SUMP DRAIN
SEE A A SEALANT
NO. 2 RESERVE TANK 
SUMP DRAIN 
NO. 1 MAIN TANK  SEE  B 
SUMP DRAIN 
NO. 2 MAIN TANK SUMP DRAIN  SEE  B 
SEE  A 
DRAIN LINE 
FITTING 

VALVE BASE
A
BOLT
WASHER (QTY 2)
NUT
(2 LOCATIONS)

SUMP DRAIN(EXAMPLE)
B
2.50 |0.01
1.25 |0.01
0.218 (+0.010/-0.000) DIA HOLE (2 LOCATIONS)
35`
VALVE BASE
A-A
NOTE: ALL DIMENSIONS ARE IN INCHES. Fuel Sump Drain Valve Installation Figure 401
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 28-11-10
 ALL  ú ú 04 Page 404 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.

C.
D.
A
747-400 MAINTENANCE MANUAL
 (b)
A00251 BMS 5-26 Type II, Class B-2References

 (1)  
AMM 12-11-01/301, Fuel Servicing

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
AMM 28-11-00/801, Fuel Tanks

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

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

 (6)  
AIPC 28-11-04, Fig. 1

 (7)
AIPC 28-11-07, Fig. 1Access

 (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 652DB Fuel Tank Access Door

Procedure
 NOTE: It is not necessary to disassemble the valve for the installation
____ procedure. If the valve is disassembled, refer to AMM 28-11-04/401 to tighten the valve seat-to-base.
 S 324-013
 (1)  Drill holes in the valve base at the locations shown in Fig. 401, if it is not drilled.
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 28-11-10
 ALL  ú ú 04 Page 405 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 144-047
 WARNING:_______ DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
 SKIN.  DO NOT BREATHE THE FUMES FROM SOLVENTS.  SOLVENTS ARE
 HAZARDOUS MATERIALS.  SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO
 THE ENVIRONMENT.  REFER TO PRODUCT MATERIAL SAFEETY DATA SHEETS

 (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (2)  
Clean the surface of the lower panel in the tank and the valve base with solvent, Series 93 (AMM 20-30-93/201).

 S 144-041

 (3)  
Remove the sealant from the bolt threads with solvent, Series 93 (AMM 20-30-93/201).

 S 864-016

 (4)  
For the fuel sump drain valve in the surge tank, make sure the spacer is installed on the bolts.

 (a)  
If the spacer is not installed, put the spacer into its position on the bolts.

 S 394-017
 (5)  
Apply the faying surface seal between the valve base and the tank lower panel or spacer (AMM 28-11-00/801).

 S 424-018

 (6)  
Put the fuel sump drain valve in its position on the bolts.

 S 434-019

 (7)  
Install the seal washer, the washer, and the nut on each bolt (2 locations).

 S 434-048

 (8)  
Tighten the nut to 30-50 pound-inches.
　
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