(3)
Install the drain valve and the O-ring on the water tank boss.

 S 414-026
 NOTE: Do not tighten the jamnut.
____
 S 414-027
 (4)  Install the valve adapter with the screw and the washers.
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 S 414-028
 (5)  Install the insulation blanket on the water tank.
 NOTE: Attach the insulation blanket with velcro tape.
____
 D. Install the Potable Water Tank (Fig. 401)
 S 424-029
 CAUTION:_______BE CAREFUL WHEN YOU INSTALL THE WATER TANK. IF THE DRAIN VALVE AND THE QUANTITY TRANSMITTER TOUCH OTHER SURFACES, DAMAGE CAN OCCUR.
 (1)  
Carefully put the water tank on the mounting brackets.

 S 414-031

 (2)  
Install or connect the items that follow:

 (a) Install the bolt assembly in the aft mounting bracket.
 NOTE: The bolt attaches to a nutplate on the outboard support
____
 bracket.

 (b)  Install the bolts and washers on the struts on the forward side of the water tank.
 NOTE: Do not tighten the bolts.
____
 (c)  
Attach the air pressure line to the water tank.

 (d)  
Attach the water fill line to the water tank.

 (e)  
Attach the overflow line to the water tank.

 (f)  
Attach the water supply line to the water tank.

 (g)  
Install the actuator shaft for the drain valve through the service panel.

 (h)  
Attach the actuator shaft coupling to the drain valve adapter with the connect pin and washers as follows: 1) Install the adapter connect pin. 2) Make sure the drain valve is closed. 3) Engage the valve shaft handle.

 (i)  
Install the electrical connection on the quantity transmitter.

 S 434-037
 (3)  Tighten the aft and the forward bolts to a torque of 25 to 30 pound-inches.
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 S 864-038
 (4)  
Supply the electrical power (AMM 24-22-00/201).

 S 454-039

 (5)  
Fill the water tank (AMM 12-14-00/301).

 S 434-040

 (6)  
Supply pressure to the water tank (AMM 38-41-00/201).

 S 094-041

 (7)  
Remove the placards you installed when you serviced the water tank.

 S 864-042

 (8)  
Permit 2 minutes of time for the pressure in the tank to become stable.

 S 864-043

 (9)  
Open one of the cold water valves in one of the lavatories until water starts to flow.

 S 864-044

 (10)
 Close the valve.

 S 214-045

 (11)
 Examine the water tank and the line connections for leaks.

 E. Put the Airplane Back to Its Usual Condition
 S 414-046
 (1)  
Replace the access panels.

 S 864-047

 (2)  
Close the WATER QTY IND circuit breaker on the P18 panel and remove the DO-NOT-CLOSE tag.

 S 864-048

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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