TOILET TANK 
LATCHES SEE  A 
TOILET 
SHROUD  ELECTRICAL 
CONNECTOR 
A 
TOILET 
TANK 
DRAIN 
VALVE 
(SEE A-A) 

A
TANK OUTLET TOILET TANK
A
Toilet Tank Drain Valve Installation Figure 401 (Sheet 1)
C81522
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A
747-400
MAINTENANCE MANUAL

ELECTRICAL
MANUAL OVERRIDE
CONNECTOR
MOTOR ACTUATOR
TOILET TANKNUT DRAIN VALVE
(8 LOCATIONS)
HOUSING
WASHER (8 LOCATIONS) TOILET TANK
GASKET
TOILET TANK DRAIN VALVE
SEAL AREA
TANK OUTLET
TOILET TANK DRAIN VALVE A-A
Toilet Tank Drain Valve Installation Figure 401 (Sheet 2)
C81545
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 034-008
 (1)  
Disconnect the electrical connector from the valve.

 S 034-009

 (2)  
Remove the nuts and washers that hold the valve on the toilet tank.

 S 024-010

 (3)  
Lift the valve out of the toilet tank.

 S 034-011

 (4)  
Remove and discard the gasket.

 TASK 38-32-63-634-012
 3.  Toilet Tank Drain Valve Installation (Fig. 401)____________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 38-32-60/501, Toilet System

 B. Access
 (1)  Location Zone 224 Upper Deck Crew Rest Body Sta 385 to 632, Right
 C. Procedure
 S 034-013
 (1)  
Put a new gasket over the studs that hold the valve.

 S 864-014

 (2)  
Do these steps to make sure the replacement valve is fully extended:

 (a)  
Put the replacement valve over the gasket.

 (b)  
Connect the electrical connector for the valve.

 (c)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on P414 Power Distribution Panel - Left: 1) 414E19 DRAIN VALVE LAV TANKS U-21

 (d)  
Operate the drain valve handle at the service panel to open the drain valve.

 NOTE: Make sure the drain valve indicator light comes on.
____
 (e)  Operate the drain valve handle at the service panel to close the drain valve.
 NOTE: Make sure the drain valve indicator light goes out.
____
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A
747-400 MAINTENANCE MANUAL
 (f)  
Open this circuit breaker on P414 Power Distribution Panel -Left and attach a DO-NOT-CLOSE tag: 1) 414E19 DRAIN VALVE LAV TANKS U-21

 (g)  
Disconnect the electrical connector from the valve.

 S 864-016
 (3)  
Push the valve down into the tank and hold it in position.

 S 434-017

 (4)  
Install the washers and nuts.

 S 434-018

 (5)  
Connect the electrical connector for the valve.

 S 864-019

 (6)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on P414 Power Distribution Panel - Left.

 (a)  414E19 DRAIN VALVE LAV TANKS U21
 S 864-020
 (7)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on P415 Power Distribution Panel - Right.
　
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