(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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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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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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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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