G.  Carefully lift and remove tank, with drain valve and quantity transmitter attached, through access panel opening.
CAUTION:  ENSURE THAT DRAIN VALVE AND QUANTITY TRANSMITTER ARE NOT DAMAGED.
H.  Remove insulation blanket from tank.
I.  Remove adapter mounting screw and washer and remove adapter from drain valve. (See detail B.)
J.  Loosen jamnut and remove drain valve and O-ring from tank boss.
K.  Remove quantity transmitter from tank. Refer to 38-11-21, Water Quantity Transmitter -Removal/Installation.
3.  Prepare for Installation
A.  Install quantity transmitter on tank. Refer to 38-11-21, Water Quantity Transmitter -Removal/Installation.

B.  Install drain valve and O-ring on tank boss. Do not tighten jamnut.
C.  Install valve adapter with screw and washer.
D.  Install insulation blanket on tank. Blanket is attached by velcro tape. 
4.  Install Passenger Water Tank
A.  Position tank in airplane.
CAUTION:  ENSURE THAT DRAIN VALVE AND QUANTITY TRANSMITTER ARE NOT DAMAGED.
B.  Loosely install or connect the following items:
(1)  
Attachment bolt assembly into aft mounting bracket. (See view 1.) Bolt attaches to a nutplate on outboard end.

(2)  
Upper attachment bolts and washers on forward side of tank. Adjust inboard strut as necessary. Leave lower bolts loosely attached.

(3)  
Air pressure, fill, overflow, supply, and drain lines.

(4)  
Drain valve actuator shaft coupling to valve adapter with adapter connecting pin and washers.

NOTE:  Install adapter connecting pin from forward end (valve closed), with shaft handle in closed position, as shown on figure 401, detai1 B.

(5)  
Quantity transmitter electrical connector.

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38-11-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/69 

C.  After all items in step D are installed, tighten aft attachment bolt to a torque of 25 to 30 pound-inches, and tighten all other items as necessary.
D.  Provide electrical power.
E.  Fill water tank. Refer to Chapter 12, Water System - Servicing.
F.  Pressurize water tank. Refer to 38-41-0, Water Tank Pressurization System - Maintenance Practices.
G.  Allow 2 minutes for pressure in tank to stabilize.
H.  Open one lavatory cold water faucet until water starts flowing, then close faucet.
I.  Check water tank and line connections for leaks.
5.  Restore Airplane to Normal
A.  Replace access panels.
B.  Close WATER QTY IND circuit breaker on panel P18.
C.  If no longer needed, remove electrical power from airplane.
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Feb 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-11-11 Page 405 

WATER QUANTITY TRANSMITTER - REMOVAL/INSTALLATION
1.  Prepare for Removal
A.  Drain water tank by opening fill and overflow valve and drain valve.
B.  Depressurize water tank (Ref 38-41-0, MP).
C.  Close drain valve and fill and overflow valve.
D.  Open WATER QTY IND circuit breaker on panel P18.
E.  Remove aft cargo compartment rear bulkhead access panels (Fig. 401).
F.  Remove water tank (Ref 38-11-11).
CAUTION:  WHILE ROTATING TANK AVOID CONTACT WITH OTHER METAL PARTS TO PREVENT SCORING OF EITHER, AND ALSO TO PREVENT DAMAGE TO TRANSMITTER OR DRAIN VALVE.
NOTE:  If desired, disconnect all connections to water tank, lift tank slightly, and rotate 90 degrees until transmitter points forward.
2.  Remove Water Quantity Transmitter (Fig. 401)
A.  Compress and remove retaining ring and pull end closure from tank.
B.  Remove transmitter fitting, with bonding lug, screws, and lockwire attached away from boss on tank top. Remove O-ring from boss.
C.  Carefully remove threaded portion of transmitter body from tank boss.
D.  Remove pin at bottom of transmitter tube. Then pull float carefully from bottom of tube and remove pin, and float from tank through tank end.
E.  Slowly pull transmitter through boss and away from tank.
3.  Install Water Quantity Transmitter
A.  Check that mounting surfaces on end closure, retaining ring, transmitter and tank are clear of flaws and foreign material.
B.  Carefully insert transmitter through boss.
C.  Carefully install float, and pin on transmitter tube through opening at tank end.
　
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