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signal goes through the waste drain ball valve proximity switch
and the vacuum blower barometric switch. The waste drain ball
valve proximity switch and vacuum blower barometric switch
must be closed for the vacuum blower to operate.
The waste drain ball valve proximity switch is closed when the
waste drain ball valve is closed.
The barometric switch is closed when the airplane is below
16,000 feet.
Training Information Point
The waste tank must be flushed at each servicing interval. If the
waste tank is not serviced correctly, unwanted waste material
can collect on the point level sensors. The waste material on the
point level sensors can cause a tank full signal and stop
operation of the lavatory toilets.
You should flush crushed ice down the toilets at regular
intervals. The crushed ice will help to prevent unwanted
material from collecting in the vacuum waste lines.
CAUTION: DO NOT USE ICE CUBES AS AN ALTERNATIVE TO
THE CRUSHED ICE. ICE CUBES CAN CAUSE
DAMAGE TO THE POINT LEVEL SENSORS IN
THE WASTE TANK.
There is a clean-out fitting in the forward vacuum waste line.
You can use the clean-out fitting to clean a blockage between
the waste tank and the forward lavatory.
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Purpose
The waste tank quantity indication system measures and shows
the quantity of waste in the waste tank.
General
These components are in the waste tank quantity indication
system:
* Waste tank point level sensor (2)
* Waste tank continuous level sensor
* Logic control module (LCM)
* Waste quantity indicator.
The waste tank quantity indication system does these functions:
* Monitors and shows the level of waste in the waste tank
* Stops operation of the toilets when the waste tank is full
* Gives indication when the lavatories stop operation for
waste tank full condition
* Gives indication when the sensors are dirty
* BIT.
Abbreviations and Acronyms
* ac - alternating current
* BIT - built in test
* C - Celsius
* dc - direct current
* F - Fahrenheit
* FCU - flush control unit
* FWD - forward
* LCM - logic control module
* mm - millimeter
* REF - reference
* TYP - typical
* v - volts
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Purpose
The point level sensor gives a signal to the logic control module
(LCM) when the waste tank is full.
Location
There are two point level sensors in the aft cargo compartment.
You remove the waste tank access panel to get access to the
point level sensors. The point level sensors are on the center
inboard side of the waste tank.
Physical Description
The point level sensor is a capacitance type sensor. It has a
sensor face and an electrical connector.
Functional Description
The LCM supplies 15v dc power to the point level sensors. The
point level sensors supply these signals to the LCM:
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