38-11-00
 ALL  ú ú 02 Page 310 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 683-106
 (12)
 Drain the tank (AMM 38-11-00/301).

 S 173-107

 (13)
 Flush the inside of the tank with water and drain the tank (AMM 38-11-00/301).

 S 173-108

 (14)
 Do the step above for three times.

 S 163-109

 (15)
 Wash the tank end caps with clean water.

 S 413-110

 (16)
 Install each end cap in the tank so that the spherical surface is inside the tank. Use a soft mallet to position the cap around the outer circumference until it is firmly seated. Make sure the O-ring is not dislodged, pinched or damaged during assembly.

 S 413-111
 CAUTION:_______ WHEN YOU ASSEMBLE THE WATER TANK, MAKE SURE THE SNAP RING IS
 INSTALLED TO COVER THE RED DEPTH LINE.  IF YOU DO NOT INSTALL
 THE SNAP RING TO COVER THE RED DEPTH LINE, YOU CAN CAUSE DAMAGE

 TO EQUIPMENT.
 (17)
 Install the snap ring in the polar ring slot.  Make sure the snap ring is installed to the point where the red depth line can not be seen.

 S 423-113

 (18)
 Close the drain valve.

 S 613-114

 (19)
 Fill the potable water tank (AMM 12-14-00/301).

 S 623-115

 (20)
 Restore pressure to the potable water system, AMM 38-41-00/201.

 S 793-116

 (21)
 Examine all the connections for leakage.  Make sure there is no leakage.

 S 413-117

 (22)
 Put the insulation cover on the tank and install the tape over the open areas.

 S 413-119

 (23)
 Replace the lining on the aft bulkhead of the aft cargo compartment.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 38-11-00
 ALL  ú ú 02 Page 311 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 POTABLE WATER TANK - REMOVAL/INSTALLATION
_________________________________________
 1.  General
_______
 A.  The procedure contains two tasks. The first task removes the potable water tank. The second task installs the potable water tank.
 TASK 38-11-11-004-001
 2.  Potable Water Tank Removal
__________________________
 A.  References
 (1)  
AMM 38-41-00/201, Water Tank Pressurization System

 (2)  
AMM 38-11-21/401, Water Quantity Transmitter

 B.  Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C.  Prepare to Remove the Potable Water Tank (Fig. 401)
 S 684-002
 (1)  Use pressure from the air pressure manifold, the air compressor, or gravity to drain the potable water tank.
 (a)  
Use the air manifold pressure or the compressor air pressure to drain the tank. 1) Pressurize the water system (AMM 38-41-00/201). 2) Open the tank drain valve. 3) When the water flow stops, remove the air pressure from the

 water system. 4) Close the tank drain valve.

 (b)  
Use gravity to drain the tank. 1) Remove the pressure from the water system

 (AMM 38-41-00/201). 2) Open the tank drain valve and the fill valve. 3) When the flow of water stops, close the tank drain valve
 and the fill valve.
 S 864-003
 (2)  
Open the WATER QTY IND circuit breaker on the P18 panel and attach a DO-NOT-CLOSE tag.

 S 014-004

 (3)  
Remove the access panel from the rear bulkhead in the aft cargo compartment.

 D.  Remove the Potable Water Tank (Fig. 401)
 S 014-049
 (1)  
Remove the electrical connector from the water quantity transmitter.

 (2)  
Remove the air pressure line from the water tank.

 S 014-008
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