(7)  Do this task:  "Water System Pressurization" (AMM 38-15-60/201).
 (8)  S 614-022Do this task:  "Fill the Water System" (AMM 12-14-61/301).
 S 794-023

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A
747-400 MAINTENANCE MANUAL
 OVERFLOW/DEPRESSURIZATION VALVE - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  This procedure gives the instructions for two tasks. The removal and the installation of the overflow/depressurization valve.
 B.  The overflow/depressurization valve is installed between the floor beams for the main deck at the aft end of forward cargo compartment.
 TASK 38-11-63-384-001
 2.  Overflow/Depressurization Valve Removal (Fig. 401)_______________________________________
 A.  General
 (1)  The overflow/depressurization valve will be referred to as the overflow valve in this procedure.
 B.  Standard Tools and Equipment
 (1)  Caps (for the water and air lines at the overflow valve)
 C.  References
 (1)  
AMM 12-14-61/301, Water System Servicing

 (2)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall

 (3)  
AMM 36-00-00/201, Pneumatic System

 (4)  
AMM 38-15-60/201, Water System Pressurization

 D.  Access
 (1)  Location Zone 124 Forward Cargo Container Compartment Aft Half, Right
 E.  Procedure
 S 864-002
 WARNING:_______REMOVE THE AIR PRESSURE FROM THE PNEUMATIC MANIFOLD. AIR WITH HIGH PRESSURE AND TEMPERATURE CAN CAUSE INJURY TO PERSONS.
 (1)  
If the pneumatic manifold is pressurized, do this task: "Release the Pressure in the Pneumatic System" (AMM 36-00-00/201).

 S 844-003

 (2)  
Do this task to drain the water system: "Water System Servicing (Drain)" (AMM 12-14-61/301).

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A
747-400
MAINTENANCE MANUAL

OVERFLOW AND DEPRESSURIZATION VALVE
SEE A
FROM PNEUMATIC
MANIFOLD AIR COMPRESSOR (REF)
SERVICE 
PANEL 
SCREW, WASHER 
(4 LOCATIONS) 
OVERFLOW/  ELECTRICAL 
PRESSURIZATION  CONNECTOR 
CLAMSHELL  VALVE 
COUPLING  BRACKET  FILTER (REF) 
1

CLAMSHELL
COUPLING

1
OVERFLOW LINE A 1
CLAMP, SLEEVE AND O-RINGS NOT SHOWN
Overflow/Depressurization Valve Installation Figure 401
C24444
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747-400
MAINTENANCE MANUAL

 S 864-005
 WARNING: MAKE SURE YOU REMOVE THE PRESSURE FROM THE WATER PRESSURIZATION
_______ SYSTEM BEFORE YOU START TO REMOVE THE OVERFLOW VALVE. THIS REMOVES THE PRESSURE THAT IS IN THE WATER PRESSURIZATION SYSTEM. AIR THAT HAS HIGH PRESSURE CAN CAUSE INJURY TO PERSONS.
 (3)  
Do this task: "Water System Depressurization" (AMM 38-15-60/201).

 S 014-026

 (4)  
For the ceiling panels in the area between RBL 35 and RBL 55 from stations 840 to 860, do this task: "Containerized Cargo Compartment Ceilings and Sidewall Linings-Removal" (AMM 25-52-01/401).

 S 034-006

 (5)  
Remove the three clamshell couplings that are installed adjacent to the overflow valve.
　
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