38-41-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 862-008
 (6)
Open the fill and overflow valve and then close the valve.

 S 862-010

 (7)  
If it is necessary to pressurize the pneumatic manifold while you do maintenance in the water system, disconnect the water tank pressurization line as follows:

 WARNING: MAKE SURE THERE IS NO PRESSURE IN THE PNEUMATIC PRESSURE
_______ LINES BEFORE YOU DISCONNECT THEM. THE HIGH PRESSURE/TEMPERATURE AIR IN THE LINES CAN CAUSE INJURY TO PERSONS.
 (a)  
Open the A/C access panel 3303 (AMM 12-31-31/201).

 (b)  
Disconnect the water tank pressurization line at the plugged T-fitting approximately 20 inches aft of the air cycle machine. 1) Put a cap or a plug on the open lines.

 (c)  
Pressurize the pneumatic manifold with the engines or the APU.

 TASK 38-41-00-862-011
 3. Water Tank Pressurization
_________________________
 A. References
 (1)  AMM 49-11-00/201, APU Power Plant
 B. Access
 (1)  Access Panel
 3303 A/C Access Panel

 C. Pressurize the Water Tank
 S 862-012
 (1)  If the water tank pressurization line has been disconnected, do these steps:
 (a)  Do the applicable steps in the Water Tank Depressurization task to release the pressure from the pneumatic manifold.
 WARNING: MAKE SURE THERE IS NO PRESSURE IN THE PNEUMATIC PRESSURE
_______ LINES BEFORE YOU REMOVE THE PLUGS OR CAPS. THE HIGH PRESSURE/TEMPERATURE AIR IN THE LINES CAN CAUSE INJURY TO PERSONS.
 (b)  Remove the plugs or caps and connect the water tank pressurization line.
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 38-41-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 862-013Pressurize the water tank with one of these steps: (a) Start the APU and put the APU bleed air switch on the P6 panel to ON (AMM 49-11-00/201). (b) Connect a nitrogen source to the air valve on the water service panel and pressurize the water tank.
 (3)  S 862-014Let 2 minutes occur for the pressure to become stable.

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 38-41-00
 ALL  ú ú 01 Page 203 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 AIR FILTER ELEMENT - SERVICING
______________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)  
Removal of the bleed air filter element.

 (2)  
Installation of the bleed air filter element.

 TASK 38-41-11-003-008
 2.  Bleed Air Filter Element Removal________________________________
 A. References
 (1)  AMM 38-41-00/201, Water Tank Pressurization System
 B. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C. Procedure
 S 863-001
 (1)
Release the pressure on the water tank (AMM 38-41-00/201).

 S 013-002

 (2)  
Remove the access panel from the rear bulkhead in the aft cargo compartment.

 S 033-003

 (3)  
Remove the lockwire on the filter case.

 S 023-004

 (4)  
Remove the filter case and the filter element from the filter assembly (Fig. 301).

 (5)  
Remove the filter element and discard.

 (6)  
Remove the filter case o-ring and discard.

 (7)  
Clean the filter case.

 S 023-005
 S 023-029
 S 143-006
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