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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - CONTINUOUS LEVEL SENSOR
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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - CONTINUOUS LEVEL SENSOR
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - CONTINUOUS LEVEL SENSOR
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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - CONTINUOUS LEVEL SENSOR
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The logic control module (LCM) measures the level of waste in
the waste tank. The LCM stops the operation of the vacuum
waste system when the waste tank is full.
Location
The LCM is in the aft cargo compartment. You get access to the
LCM through the waste tank access panel on the left side of the
cargo compartment.
The LCM is above and forward of the waste tank.
Physical Description
The LCM has these features:
* Electrical connectors (4)
* Test switch
* Indicator lights (5).
Two of the electrical connectors are for the point level sensors.
One electrical connector is for the continuous level sensor. One
electrical connector is for the power and signal connections to
the airplane.
The test switch is a three-position (center off) momentary
switch. In the UP position (TEST SENSORS), the LCM starts a
power-up sequence which includes a full system BIT test. In the
DOWN position (TEST LAMPS), a test of the LEDs occurs. If the
test switch is held down for more than 10 seconds and the point
level sensors are disconnected, an auto zero adjustment of the
continuous level sensor will occur.
The five indicator lights are LEDs. These are the labels for the
LEDs:
* SENSOR J1
* SENSOR J2
* SENSOR J3
* TANK FULL
* POWER ON.
The SENSOR J1 and SENSOR J2 LEDs show the status of the
two point level sensors. The SENSOR J3 LED shows the status
of the continuous level sensor. The TANK FULL LED shows the
status of the waste tank and the LCM. The POWER ON LED
shows that system power is on.
The POWER ON LED is green. The other LEDs are red.
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - LOGIC CONTROL MODULE
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Functional Description
The LCM gets data from the two point level sensors and the
continuous level sensor. The LCM uses the data from the
continuous level sensor to calculate the level of the waste in the
waste tank.
The LCM sends a waste tank level signal to the waste tank
quantity indicator on the attendant panel.
A tank full signal from the continuous level sensor does not
affect toilet operation.
The two point level sensors are level switches. When the level
of the waste in the waste tank covers 50 percent of the face of a
point level sensor, the point level sensor sends a tank full signal
to the LCM. When both point level sensors send a tank full
signal to the LCM, the LCM stops the operation of the toilets.
The LCM uses a delay of 20 seconds on the point level sensor
data before it stops the operation of the toilets. This delay
makes sure that there is a stable tank full signal and prevents
the effects of momentary tank full signals due to airplane
maneuvers or turbulence.
In normal circumstances, both point level sensors must send
the tank full signal to the LCM for the LCM to stop toilet
operation. However, when one point level sensor has an error,
the LCM uses a tank full signal from the other point level sensor
to stop toilet operation. If both point level sensors have an error,
the LCM will stop toilet operation.
Lamp Test
You do a lamp test when you put the test switch in the TEST
LAMPS position.
During the lamp test, the four software-controlled LEDs on the
LCM come on. The green POWER ON LED will be on when
system power is on.
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
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