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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
operate correctly:
* Point level sensors
* Continuous level sensor
* LCM.
During the power-up BIT test, the LEDs flash momentarily and
then come on for three seconds. If all components pass the BIT
test, all LEDs go off. If a component did not pass the BIT test, the
related LED flashes at a two Hz rate. The results of the BIT test
for the LCM are reported by the TANK FULL LED.
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - LOGIC CONTROL MODULE
EFFECTIVITY
GUN ALL 38-33-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-33-00-004
To do the power-up BIT test, put the LCM test switch in the TEST
SENSORS position. You can also do the power-up BIT test by a
push of the test switch on the attendant panel waste quantity
module.
After the LCM completes the power-up BIT test, it then starts a
continuous monitor cycle. This monitor cycle occurs every five
milliseconds. The monitor cycle makes sure that the point level
sensors and LCM are functional. The continuous level sensor
does not do a test during the monitoring cycle.
If the continuous level sensor fails after the power-up BIT test is
complete, the failure will not be sensed. An erroneous signal
from the continuous level sensor will not affect toilet operation.
You can detect errors in the continuous level sensor when you
do the power-up BIT test.
LED Status
The four red LEDs show system status. System status updates
every 250 milliseconds.
These are the conditions necessary for LED status:
LED
STATUS
OFF ON FLASHING *[1]
SENSOR J1 Tank not full. Tank full or sensor
disconnected.
Sensor fouled or
sensor failed BIT.
SENSOR J2 Tank not full. Tank full or sensor
disconnected.
Sensor fouled or
sensor failed BIT.
LED
STATUS
OFF ON FLASHING *[1]
SENSOR J3 Tank not full. Tank is above full. Sensor failed BIT.
TANK FULL Tank not full, FCU
powered.
Tank full, FCU
power off.
Two Hz flash: LCM
failed BIT. Eight Hz
flash: fatal error.
*[1] Flashing rate is two Hz unless otherwise noted.
Auto Zero Adjustment
You must do the auto zero adjustment when one of these
conditions occur:
* When you move or replace the continuous level sensor
* When you move or replace the waste tank.
You use the LCM to do the auto zero adjustment. The auto zero
adjustment calibrates the LCM for variations between the
remote diaphragm and sensor module on the continuous level
sensor.
To do the auto zero adjustment, you must make sure that the
waste tank is fully drained. You must disconnect the point level
sensors. Then you put the test switch in the TEST LAMPS
position for more than 10 seconds.
These lights will go off for three seconds to show that the test is
complete:
* SENSOR J1
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - LOGIC CONTROL MODULE
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