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* Stops operation of the toilets
* Sends a full tank signal to the waste system module.
The full tank signal causes the LAVS INOP light to come on.
The CLEAN/CHECK SENSOR light comes on when the waste
tank level is three inches (7.6 cm) or more below the tank full
level and one of these conditions occur:
* A point level sensor is fouled (dirty)
* A point level sensor has failed the power-up BIT test or the
continuous monitoring test
* There is a sensor disagreement.
A sensor disagreement occurs when one point level sensor
sends a tank full signal and the other point level sensor sends a
tank not full or sensor fouled signal.
System BIT
When system power comes on, the LCM does a power-up BIT
test. The power-up BIT test makes sure that these components
operate correctly:
* Point level sensors
* Continuous level sensor
* LCM.
You can do the power-up BIT test at anytime when you do one of
these steps:
* Push the LAVS INOP test switch on the waste system module
* Put the test switch on the LCM in the TEST SENSORS
position.
After the LCM completes the power-up BIT test, it starts a
continuous monitor cycle. This monitor cycle makes sure that
the point level sensors and the LCM are functional. The
continuous level sensor does not do a test during the monitor
cycle.
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Purpose
The water tank pressurization system pressurizes the potable
water tank.
General Description
Pressure for the water tank comes from the pneumatic system
or the air compressor.
The water tank pressurization system has these functions:
* Controls the air pressure that goes into the water tank
* Selects the source of the pressurized air
* Prevents contamination from unwanted material in the air.
Abbreviations and Acronyms
* AC - alternating current
* fwd - forward
* psig - pounds per square inch gage
* ref - reference
* S - switch
* typ - typical
* V - volts
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General
The water tank pressurization components are in the aft cargo
compartment.
The air compressor is forward of the waste tank on a shelf
below the vacuum blower.
The pneumatic equipment components are on the ceiling
forward of the aft cargo compartment bulkhead liner.
The water tank components are aft of the aft cargo compartment
bulkhead liner.
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