-
The flush control unit function
-
The indication function
-
The liquid level sensor test function
-
The motor starting relay function.
-
The control logic
-
The ARINC 429 data bus (ARINC Output)
-no data from CFDIU (ARINC Input).
R **ON A/C 106-149, 301-399, 401-499,
(3) Operation Mode - Sensor Failures
(a)
If the LLT does not operate:
-The system will continue to operate (the DIR monitors the LLS to sense when the waste tank is full).
(b)
If the LLS does not operate:
-The system will continue to operate (the DIR monitors the LLT to sense when the waste tank is full).
(c)
If the differentail pressure signal (from the SDAC) does not operate, the system will continue to operate as follows:
-The CFDS (maintenance phase) signal is used to give the
information ON GROUND or IN FLIGHT
-On the ground the vacuum generator will operate
-In flight the vacuum generator is inhibited.
(d)
If both the differentail pressure signal and the CFDS (maintenance phase) signal falsely indicate high altitude:
-The vacuum generator will not work on ground
-If the CFDS (maintenance phase) signal is not available, the LG signal is used as a backup
-The toilets will however work normally at high altitude (cabin differential pressure).
(e)
Waste Service Panel Door Switch (WSPDS) 44MG Failure indicates door open DEU B (RH 8) and door closed DEU B (RH 7).
1 On the ground:
_ a The system will not operate if both DEU B's or SW or wiring
_
failure
b The VACUUM SYSTEM DISABLED - GROUND SERVICING on the FAP is
_
ON.
2 In Flight:
_ a The system will however (ignore ground sevicing) operate
_
b In this situation the VACUUM SYSTEM DISABLE message will go
_
OFF
c They will come ON again after the landing.
_
(f) If the WSPDS 44MG does not operate (indicates door close):
-the system will operate on the ground and in the air as normal.
NOTE : If the LLS and the LLT do not operate, the system will not
____ operate and the VACUUM SYSTEM DISABLED-WASTE TANK FULL message on the FAP comes ON.
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(4) Fault Handling
(a)
All detected system faults during current flight are continuously transmitted to the ARINC 429 data bus and are recorded. On request you can also call up the faults of previous flights (for first and second line maintenance) of the Line Replaceable Units LRU's. LRU's are:
-
The toilet assembly (assemblies)
-
The vacuum generator
-
The liquid level sensor.
(b)
All Shop Replaceable Units (SRU) defects data are continuously transmitted to the ARING 429 data bus and are recorded for third line maintenance (shop maintenance).
(c)
On request you can also call up the faults of previous flights. The SRU are:
-
The toilet assembly water valve, flush valve and flush control unit
-
The liquid level transmitter.
(d)
Fault Data which the DIR transmits through ARINC 429:
1_ Toilet Assembly Faults:
- The water valve solenoid
- The flush valve motor
- The flush valve limit switch (open position)
- The flush valve limit switch (closed position)
- The flush control unit.
- The water valve alarm (critical).
NOTE : The identification letter for toilet location is____
transmitted together with fault message for fault
location.
2_ The Liquid Level Transmitter Fault.
3_ The Vacuum Generator Overheat.
4_ The Liquid Level Sensor Fault.
5_ The Aircraft Power Supply 115 V/400 Hz.
6_ The motor start relay.
7_ The Waste Service Panel Door Switch
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8 The System Power Supply
_
(e) Transmission Modes
1_ No Fault/Fault data is transmitted in two modes:
- The normal transmission mode
- The menu mode.
The Normal Transmission Mode: In the normal transmission mode
the DIR transmits continuously NO FAULT/FAULT data of the
vacuum toilet system during flight. The CFDS receives these NO
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