c_ Vacuum generator (overheat) defect:
- The VSC stops the power supply to the vacuum generator
and the toilet flush cycle stops (on the ground and in
flight below 4877 m (16000 ft.)).
2 The VSC will transmit and keep the defect data but the system
_ will operate normally if:
-The LLT indicates a full tank (current signal 12.9 mA). and the LLS does not
3 The VSC will stop the system operation and the SYS INOP legend
_ on the FAP comes on if:
-The LLS indicates a full tank and the LLT does not.
4 The VSC will stop the system operation and the SYS INOP legend
_ on the FAP comes on if:
-
The LG falsely indicate ON GROUND
-
The service panel door falsely indicates door OPEN when the aircraft is in flight.
**ON A/C 052-055, 057-057,
(2) Control Function The control functions of the VSC are:
-
The normal operation
-
The failure mode.
(a) Normal Operation
1 When the VSC receives a signal from a FCU:
_ -It stops the operation all other FCU's
-makes an analysis of the altitude pressure switch indication
-Starts the vacuum generator if the altitude pressure switch gives a signal low (below 5487 m (18000 ft.))
-Stops power supply to the vacuum generator if the altitude pressure switch gives a signal high (above 5487 m (18000 ft.))
-
Examines for defects in the aircraft power supply 115 V/400 Hz
-
Examines continuously the vacuum generator for overheat signals during the flush cycle if there is no 115 V/400 Hz defect.
1EFF : 001-049, 051-099, 101-105, 151-199, 1 38-31-00Page 59 1201-299, 1Aug 01/05R 1 1 1CES 1
2 The VSC calculates and transmits the signal to the FAP:
_
-To show the level of the waste in the waste holding tank.
3 When the limit switch on the waste service panel indicates
_
OPEN panel and the aircraft is on ground (CFDS):
-
The VSC stops all toilet operations and the flush signals are ignored
-
The SYS INOP light on the FAP is switched on.
4 If the LG signal indicates Flight and the waste service panel
_
is open:
-The system will not be disabled and it will be able to flush the toilets while the servicing is done.
5 The VSC will not react on a single LG fault, because the VSC
_
BITE does not control the LG signal.
(b) Failure Mode
1 The VSC transmits the system defects to the ARINC 429 data
_
bus.The VSC memorizes the defect signals for ground
maintenance and inspection. These signals are:
a The flush control unit defect:
_
-All corresponding toilet operations are stopped and the defective LAV INOP legend on the FAP comes on.
b 115 V AC power supply shutdown (no signal input for at
_
least one second):
-
The toilet which is in the flush cycle will stop and the VSC will indicate system INOP on the FAP
-
The VSC will start normal operation again when the power supply has returned for at least 1 second.
c Vacuum generator (overheat) defect:
_
-The VSC stops the power supply to the vacuum generator and the toilet flush cycle stops (on the ground and in flight below 5487 m (18000 ft.)).
2 The VSC will transmit and keep the defect data but the system
_
will operate normally if:
-The LLT indicates a full tank (current signal 12.9 mA). and the LLS does not
3 The VSC will stop the system operation and the SYS INOP legend
_
on the FAP comes on if:
-The LLS indicates a full tank and the LLT does not.
R 1EFF : 052-055, 057-057, 1 38-31-00Page 60 1 1 Aug 01/05 1 1 1CES 1 4 The VSC will stop the system operation and the SYS INOP legend
_
on the FAP comes on if:
-
The LG falsely indicate ON GROUND
-
The service panel door falsely indicates door OPEN when the aircraft is in flight.
R **ON A/C 106-149, 301-399, 401-499,
(2) Vacuum System Control Function (VSCF)
The control functions of the DIR are:
-
The normal operation
-
The failure mode.
(a) Normal Operation
1 When the DEU B receives a signal from a FCU:
_ -It sends the signal to the DIR 1-2.
2 The DIR 1-2:
_
-Makes an analysis of the signal from the SDAC
-
Starts the vacuum generator if the differential pressure signal is less than 246 mbar during climb
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