(b) Results of power-up tests
1 In case of a bite test failure, the VSC will send the failure
_ to the CFDS.
(c) Continuous Monitoring Continuous monitoring is used on the ground and during flight and makes sure that the system operates correctly. It monitors:
-
The VSC internal circuits,
-
The power supplies,
-
The microprocessor,
-
The memories,
-
The input and output signals,
-
The system external circuits.
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R **ON A/C 106-149, 301-399, 401-499,
A. System Monitoring and Control
(Ref. Fig. 011A, 012A)
(1) Monitoring The CIDS has a Built-In Test Equipment (BITE) which operates in two modes for the vacuum toilet system:
-
The power-up test,
-
The continuous monitoring of the Vacuum System Control Function (VSCF).
(a) Power-Up test
1 Initialization of the power-up test (Ref. AMM 23-73-00).
_
2 The CIDS monitors if the following external system circuits
_
function correctly:
-
The flush control units,
-
The liquid level transmitter 40MG,
-
The liquid level sensor 41MG,
-28V DC,
-
The motor start relay,
-
The waste service panel-limit switch 44MG.
3 During the flush cycle the BITE monitors:
_
-
The vacuum generator 37MG,
-
The aircraft power supply 115 V AC (400 Hz).
(b)
Continuous Monitoring (DIR 1/DIR 2) Continuous monitoring (VSCF) is used on the ground and during flight and makes sure that the system operates correctly.
(c)
The VSCF monitors:
-The system external circuits of the vacuum toilet system.
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(2) Control Function
The control functions of the VSC are:
-
The normal operation
-
The failure mode.
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WATER/WASTE Menue Page
Figure 012A
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(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 4877 m (16000 ft.))
-Stops power supply to the vacuum generator if the altitude pressure switch gives a signal high (above 4877 m (16000 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.
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
R 1EFF : 001-049, 051-051, 056-056, 058-099, 1 38-31-00Page 58 1101-105, 151-199, 201-299, 1Aug 01/05 1 1 1CES 1 -The VSC will start normal operation again when the power supply has returned for at least 1 second.
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