S 424-086
(2)
Put the bracket [4] in its position.
S 424-074
(3)
Install the screws [3].
S 424-075
(4)
Attach the water tubes to the drain valve [1] with B-nuts [2].
S 424-076
(5)
Tighten the B-nuts [2].
D. Drain Valve Installation Test
S 864-087
(1)
Do this task: Potable Water System - Pressurization (AMM 38-41-00/201).
(2)
Turn the handle for the drain valve to the OPEN position.
S 794-077
(3)
Make sure there are no leaks.
(a) If there is a leak, replace the selector valve in the lavatory.
(4)
Turn the handle for the drain valve to the CLOSED position.
S 864-078
S 864-088
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737-300/400/500MAINTENANCE MANUAL
S 794-091
(5)
Turn the selector valve in the lavatory to the DRAIN position.
S 794-089
(6)
Make sure there are no leaks.
S 864-092
(7)
Turn the selector valve in the lavatory to the ON position.
E. Put the Airplane Back in Its Usual Condition
S 864-090
(1)
Close this circuit breaker:
(a) Circuit Breaker Panel, P18-3:
1) 18F13 LAVATORY WATER HEATER A
(2)
Close the cabinet below the sink.
S 864-084
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737-300/400/500MAINTENANCE MANUAL
WATER TANK DRAIN VALVE - REMOVAL INSTALLATION
_____________________________________________
1. General
_______
A. This procedure includes two tasks:
(1)
The removal of the drain valve for the water tank.
(2)
The installation of the drain valve for the water tank.
TASK 38-11-51-004-004
2. Drain Valve Removal (Fig. 401)
___________________
A. References
(1) AMM 38-41-00/201, Water Tank Pressurization System
B. Access
(1) Location Zone
220 Aft Cargo Compartment Equipment Bay
C. Prepare for the Removal
S 864-001
(1) Use the pressure drain or the gravity drain procedure to drain the water tank as follows:
(a)
Pressure drain the tank. 1) Pressurize the water system (AMM 38-41-00/201). 2) Open the tank drain valve. 3) When there is no flow of water from the drain outlet, close
the tank drain valve. 4) Release the pressure from the water system (AMM 38-41-00/201).
(b)
Gravity drain the tank. 1) Release the pressure from the water system if there is
pressure on the system (AMM 38-41-00/201). 2) Open the tank drain valve and the fill and overflow valve. 3) When the water flow stops from the drain outlet, close the
tank drain valve and the fill and overflow valve.
S 864-002
(2)
Open the WATER QTY IND circuit breaker on the P18 panel and attach a DO-NOT-CLOSE tag.
S 014-003
(3)
Remove the access panel on the rear bulkhead in the aft cargo compartment.
S 014-005
(4)
Get access to the drain valve through the insulation blanket that attaches with the Velcro tape.
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