(3)  
Clean the mating surfaces of the frame and base.

 S 392-013

 (4)  
Apply the sealant to the mating surfaces of the valve frame and valve base.

 S 422-011
 S 142-012
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 51-41-12
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A
747-400 MAINTENANCE MANUAL
 S 432-014
 (5) Install the fasteners to attach the valve frame and valve base.
 NOTE: Make sure the valve plate is in the center on the hole in
 0.12 inch of the centerline.##
 S 412-052
 (6)  
Put the cover in its position on the tank.

 S 432-053

 (7)  
Install the fasteners to attach the cover to the tank.

 S 422-016

 (8)  
To install the tank that is near the door No. 5, do the steps that follow:

 (a)  
Put the tank in its position.

 (b)  
Install the fasteners to attach the tank to the hanger channels at each corner.

 S 432-017
 (9)  
Install the inflow drain line at each end of the tank.

 S 432-054

 (10)
 Install the outflow drain line at the bottom of the tank.

 TASK 51-41-12-202-018
 4.  Examine the Sump Tank and Valve (Fig. 201)_______________________________
 A. Equipment
 (1)  Hose - Water, Garden Variety or Equivalent
 B. Access
 (1)  Location Zones
 151/152 Area Aft of Bulk Cargo Compartment

 C. Procedure
 S 712-019
 (1)  To examine the drain system, use the hose to put the water in the floor drains.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

COVER 
SUMP TANK  INFLOW 
SEE  A  DRAIN LINE 

SUMP TANK
FASTENER SEE A (18 LOCATIONS)
TANK VALVE SEE B
OUTFLOW  INFLOW 
DRAIN LINE  DRAIN 
LINE 
BODY 
SKIN  FASTENER 
(4 LOCATIONS) 
NUT  RESTRICTOR 
FRAME  PLATE  SUMP TANK 
A 
FASTENER 
(4 LOCATIONS)
SPRING 
VALVE PLATE  FASTENER 
(2 LOCATIONS) 
VALVE 
B 

Sump Tank and Valve Installation
Figure 201

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A
747-400 MAINTENANCE MANUAL
 S 212-020
 (2)  
If the water does not flow freely from the outflow drain line, examine the restrictor plate in the drain opening at the body skin for unwanted materials.

 S 162-021

 (3)  
Clean the restrictor plate.

 S 212-022

 (4)  
Examine the valve for unwanted materials, weak or broken spring, or dirty plate.

 S 162-055

 (5)  
Clean the valve if it is necessary.

 S 712-023

 (6)  
To examine the cleaned valve, do the steps that follow:

 (a)  Put the water in the tank and push the valve plate down with your finger.
 NOTE: The water must not drain when you push the valve plate
____
 down.

 (b)  Release your finger from the valve plate.
 NOTE: The water must drain freely when you release your finger
____ from the valve plate.
 TASK 51-41-12-202-024
　
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