F93070
500  Water Tank Pressurization System Filter Element Installation 
May 15/80  Figure 301  38-41-11 
Page 301 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

WATER TANK PRESSURIZATION SYSTEM FILTER - REMOVAL/INSTALLATION
1. Remove Water Tank Pressurization System Filter
A. Depressurize water tank (Ref 38-41-0 MP).
B. Remove the aft cargo compartment rear bulkhead access panel.
C. Disconnect air lines from filter (Fig. 401).
D. Remove filter mounting bolts and remove filter from mounting bracket.
E. Install air line protective caps.
2. Install Water Tank Pressurization System Filter
A. Remove protective caps from air lines.
B. Position assembled filter on mounting bracket and install filter mounting bolts (Fig. 401).
NOTE: Check that outlet side of filter is aft.
C. Connect air lines to filter.
D. Replace access panel.
E. Pressurize water tank (Ref 38-41-0 MP).
500 
Aug 01/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-41-11 Page 401 

F94513
Water Tank Pressurization System Filter Installation  506 
38-41-11  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

WATER TANK PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
1. Remove Water Tank Pressure Relief Valve (Fig. 401)
A. Depressurize water tank (AMM 38-41-0/201).
B. Remove the aft cargo compartment rear bulkhead access panel.
C. Turn pressure relief valve counter clockwise to remove it from fitting.
WARNING:  DO NOT TURN THE DEFLECTOR CAP WHEN YOU REMOVE OR INSTALL THE PRESSURE RELIEF VALVE. THE PRESSURE AT WHICH THE RELIEF VALVE RELEASES PRESSURE CAN CHANGE IF THE DEFLECTOR CAP TURNS. IF THE PRESSURE RELIEF VALVE DOES NOT RELEASE AT THE CORRECT PRESSURE, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
NOTE:  If it is necessary, use a suitable tool to hold fitting while loosening pressure relief valve.
D. Install protective cap on fitting
E. Discard O-ring
2. Install Water Tank Pressure Relief Valve (Fig. 401)
A. Remove protective cap from fitting for pressure relief valve.
B. Install pressure relief valve with a new O-ring.
WARNING:  DO NOT TURN THE DEFLECTOR CAP WHEN YOU REMOVE OR INSTALL THE PRESSURE RELIEF VALVE. THE PRESSURE AT WHICH THE RELIEF VALVE RELEASES PRESSURE CAN CHANGE IF THE DEFLECTOR CAP TURNS. IF THE PRESSURE RELIEF VALVE DOES NOT RELEASE AT THE CORRECT PRESSURE, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
NOTE:  If it is necessary, use a suitable tool to hold fitting while loosening pressure relief valve.
C. Pressurize water tank (AMM 38-41-0/201).
D. Inspect fitting at pressure relief valve for air leaks.
E. Return airplane to normal configuration.
500 
May 01/00  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-41-51 Page 401 

F94513
Pressure Relief Valve Installation  500 
38-41-51Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/00 

WATER TANK PRESSURE RELIEF VALVE - ADJUSTMENT/TEST
1. General
A.  The purpose of this test is to verify that the water tank pressure relief valve vents off excess pressure within the correct pressure range.
2.  Equipment and Materials
A.  Pressure gage (0-80 psig ±0.5 psig)
B.  Control valve (pressure rating 150 psig minimum, 3/8 inch minimum globe type, 15 scfm minimum, flow at 50 psig)
C.  Pressure regulator (pressure rated for air source, outlet pressure adjustable, zero to 100 psig, 3/8 inch minimum)
D.  Air filter (in-line type)
E.  Compressed air source (regulated 80 psig, 15 scfm minimum)
F.  Flexable air hoses for test setup (pressure rated for air source greater than 100 psig)
3.  Water Tank Pressure Relief Valve Test (Fig. 501)
A.  Remove pressure relief valve (AMM 38-41-51/401).
WARNING:  DO NOT TURN THE DEFLECTOR CAP WHEN YOU REMOVE OR INSTALL THE PRESSURE RELIEF VALVE. THE PRESSURE AT WHICH THE RELIEF VALVE RELEASES PRESSURE CAN CHANGE IF THE DEFLECTOR CAP TURNS. IF THE PRESSURE RELIEF VALVE DOES NOT RELEASE AT THE CORRECT PRESSURE, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
B.  Using schematic in figure 501 as a guide, connect equipment and pressure relief valve to a regulated clean oil-free source of compressed air.
　
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