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Physical Description
The waste quantity indicator is a part of the waste system
module. The waste system module has these features:
* Waste quantity indicator
* CLEAN/CHECK SENSOR light
* LAVS INOP light and test switch.
Operation
The waste quantity indicator shows the waste quantity with a
LED segment display. The LED segment display shows the
waste quantity from E (empty) to F (full) in 1/8-tank increments.
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 failed the system BIT 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.
The LAVS INOP light comes on when both point level sensors
send a tank full signal.
You can do the system BIT test when you push the LAVS INOP
test switch. If all components pass the system BIT test, the
waste quantity indicator shows a full tank and the CLEAN/
CHECK SENSOR light is off.
Training Information Point
The CLEAN/CHECK SENSOR light shows problems with the
point level sensors. When the waste tank level is three inches
(7.6 cm) or less from the waste tank full level, the CLEAN/
CHECK SENSOR light is disabled and can not come on. The
CLEAN/CHECK SENSOR light is disabled to prevent nuisance
indications when splashes from turbulence or airplane
maneuvers could cause the light to come on. The signal to
disable the CLEAN/CHECK SENSOR light comes from the
continuous level sensor, through the logic control module.
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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - WASTE QUANTITY INDICATOR
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Power
The 28v dc ground service bus supplies power to the waste tank
quantity indication system.
Displays
The continuous level sensor sends waste level data to the logic
control module (LCM). The LCM sends a waste level signal to
the waste system module. The waste system module contains
logic which controls which LEDs to turn on. The waste quantity
indicator shows the waste level in 1/8 tank intervals. The E
(empty) LED will be on when the waste quantity indication
system has power.
When both point level sensors send a full tank signal to the
LCM, the LCM does these steps:
* 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.
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - FUNCTIONAL DESCRIPTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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WATER AND WASTE(28)
