S 434-007

 (2)  
Engage the thread of the valve assembly in the retainer and tighten with the installation tool.

FUSELAGE

Drain Valve Installation
Figure 401

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 51-41-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MAIN DECK CARGO EQUIPMENT DRAINAGE - MAINTENANCE PRACTICES
__________________________________________________________
 1.  General_______
 A. This procedure contains seven tasks:
 (1)  
The first task is the removal of the sump tank valves.

 (2)  
The second task is the installation of the sump tank valves.

 (3)  
The third task is to examine the sump tank and valves.

 (4)  
The fourth task is to examine the steerable power drive units.

 (5)  
The fifth task is to examine the non-steerable power dirve units.

 (6)  
The sixth task is to examine the floor drains.

 (7)  
The seventh task is to examine the drip pans below the retractable power drive units.

 TASK 51-41-12-002-001
 2.  Sump Tank Valve - Removal (Fig. 201)_________________________
 A. General
 (1)  For the tank that is near the door No. 5, get access to the under-floor compartment through the door in the aft wall of the bulk cargo compartment.
 B. Access
 (1)  Location Zones
 151/152 Area Aft of Bulk Cargo Compartment

 C. Procedure
 S 032-002
 (1)  
Disconnect the inflow drain line at each end of the tank.

 S 032-049

 (2)
Disconnect the outflow drain line at the bottom of the tank.

 S 032-003

 (3)  
Remove the fasteners that attach the tank to the hanger channels at each corner of the tank and at the lower tank.

 (4)  
Remove the fasteners that attach the cover to the tank.

 (5)  
Remove the cover.

 S 032-005

 (6)  
Remove the fasteners in the tank that attach the valve frame to the valve base.

 S 032-004
 S 032-050
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 51-41-12
 CARGO EQUIPMENT  ú ú 01 Page 201 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 032-051
 (7)  
Remove the valve frame, plate, and spring.

 S 032-006

 (8)
Remove the nut that attaches the valve spring to the plate.

 S 032-007

 (9)  
If it is necessary, remove the fasteners that attach the valve base to the tank.

 NOTE: Break the sealant and remove the valve base.
____
 S 022-008
 (10) To remove the tanks that are below the baggage compartments (if they are installed), do the steps that follow:
 (a) Remove the fasteners that attach the cover to the tank.
 NOTE: Get access below the cargo tracks.
____
 (b)  
Remove the cover.

 (c)  
Remove the valve, refer to "Sump Tank Valve" task.

 TASK 51-41-12-402-009
 3.  Sump Tank Valve Installation (Fig. 201)____________________________
 A. Consumable Materials
 (1)  A00490 Sealant - BMS 5-95, Class B
 B. Access
 (1)  Location Zones
 151/152 Area Aft of Bulk Cargo Compartment

 C. Procedure
 S 432-010
 (1)  
To install the valve base on the bottom of the tank (if it is removed), do the steps that follow:

 (a)  
Clean the mating surfaces of the tank and fitting.

 (b)  
Apply the sealant to the mating surfaces of the tank and valve base.

 (c)  
Install the fasteners.

 (2)  
Assemble the valve frame, plate and spring.
　
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