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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The potable water system supplies water to the lavatories and
galleys.
General Description
The potable water system has these subsystems:
* Passenger water
* Water heating
* Water quantity indication.
The passenger water system supplies water to the lavatories
and galleys.
The water heating system heats the water supplied to the
lavatory hot water faucets.
The water quantity indication system measures and displays
the quantity of water in the potable water system.
Abbreviations and Acronyms
* ac - alternating current
* C - celsius
* dc - direct current
* E - empty
* F - Fahrenheit
* F - filter
* F - full
* fwd - forward
* H - heater
* ind - indication
* lav - lavatory
* LED - light emitting diode
* psig - pounds per square inch, gauge
* QTY - quantity
* REF - reference
* S - switch
* T - transmitter
* TYP - typical
WATER/WASTE - POTABLE WATER - INTRODUCTION
EFFECTIVITY
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WATER/WASTE - POTABLE WATER - INTRODUCTION
WATER/WASTE - POTABLE WATER - INTRODUCTION
EFFECTIVITY
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WATER/WASTE - POTABLE WATER - INTRODUCTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Functional Description
The potable water system has one tank that holds potable
water.
You fill and drain the water tank at the water service panel.
To fill the water tank, open the fill/overflow valve and add water
through the potable water fill fitting until the water flows from
the potable water drain port.
The water tank supplies water to these locations:
* Galley faucets
* Lavatory faucets
* Lavatory toilets.
Each lavatory has a water supply shutoff valve. The water
supply shutoff valve lets you isolate the water supply to the sink
or to the toilet. The water supply shutoff valve also lets you
isolate the sink and the toilet at the same time.
The forward lavatory has a drain valve. The forward lavatory
drain valve drains water from the forward water supply lines.
A water heater in each lavatory increases the temperature of
the water supplied to the hot water faucet.
The water tank level sensor sends the water quantity data to a
water quantity transmitter. The water quantity transmitter sends
the data to a water quantity indicator at the attendant panel. The
water quantity indicator shows the level of water in the tank.
To drain the potable water system, you open these valves:
* Water tank drain valve
* Forward lavatory drain valve (forward lavatory only)
* Lavatory water supply shutoff valves (one in each lavatory).
When you drain the potable water system, the water drains
overboard through the forward and aft potable water drain
ports.
Training Information Point
When you drain the potable water system, you must drain water
from these two areas:
* Water service panel
* Forward lavatory.
The water service panel lets you drain the water tank and aft
supply lines. The forward lavatory has a drain valve that lets
you drain the forward water supply lines.
WATER/WASTE - POTABLE WATER - FUNCTIONAL DESCRIPTION
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When you drain the potable water system, you must turn the
water supply shutoff valves in each lavatory to the SUPPLY ON
position. If you do not turn the water supply shutoff valve to the
SUPPLY ON position, water will not drain from the toilet or
　
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