R **ON A/C 106-149, 301-399, 401-499,
E. Liquid Level Transmitter 40MG The LLT gives the waste content level of the waste holding tank from empty to full. It measures the hydrostatic pressure of the tank contents. The LLT is connected electrically to the DEU B. It gives the DEU B an analog signal for the waste content of the tank. The DEU B transmits the signal to the DIR 1-2. The signal to the Flight Attendant Panel (FAP) for waste quantity indication comes from the DIR 2 and the DIR 1
F. Liquid Level Sensor 41MG The LLS is an ultrasonic type sensor, it is connected electrically to the DEU B. When the waste holding tank content level is at full, the LLS sends a signal to the DEU B. When the CIDS receives a tank full signal, (from the LLS) the DIR shuts down the toilet systems. The signal also goes to the FAP through the DIR 2 and DIR 1 and the message "WASTE TANK NOT EMPTY-CHECK LEVEL GROUND SERVICE REQUIED". Under normal operation the LLS has the priority to transmit tank full to the DEU B.
NOTE : The liquid level sensor operates independently of the liquid level
____
transmitter.
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G. Vacuum System Controller 31MG
**ON A/C 001-049, 051-099, 101-105, 201-299,
(Ref. Fig. 009)
**ON A/C 151-199,
(Ref. Fig. 009A)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
The Vacuum System Controller (VSC) functions are:
-System control and monitoring
-Fault reporting. The VSC calculates and transmits signals to the FAP to indicate the waste tank levels and reports system defects. The VSC memorizes and also signals the system defects to the ARINC 429 data bus which is connected to the Centralized Fault Display System (CFDS). Defect signals are also sent to a RS 232-C interface for ground maintenance and inspection.
**ON A/C ALL
6. Test
____
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
A. System Monitoring and Control
(Ref. Fig. 010, 011, 012)
(1) Monitoring The VSC has a Built-In Test Equipment (BITE) which operates in two modes:
-
The power-up test,
-
The continuous monitoring.
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Vacuum System Controller - Schematic
Figure 009
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Vacuum System Controller - Schematic
Figure 009A
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BITE Fault Information - Vacuum Toilet System
Figure 010 (SHEET 1)
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BITE Fault Information - Vacuum Toilet System
Figure 010 (SHEET 2)
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Control System Menu
Figure 011 (SHEET 1)
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Control System Menu
Figure 011 (SHEET 2)
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Control System Menu
Figure 011A (SHEET 1)
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Control System Menu
Figure 011A (SHEET 2)
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Miscellaneous Module
Figure 012
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(a) Power-Up Test
1_ The power-up test starts automatically when:
- The VSC is energized with 28VDC,
- The aircraft is in the ground configuration.
2_ The BITE test monitors the internal operation of the VSC which
are:
- The power supplies,
- The microprocessor,
- The memories,
- The input and output signals.
3_ The BITE test monitors if the following external system
circuits operate correctly:
- The flush control units,
- The liquid level transmitter 40MG,
- The liquid level sensor 41MG,
- The altitude pressure switch 43MG.
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