(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.
 **ON A/C 001-049, 051-051, 056-056, 058-099, 101-105, 151-199, 201-299,
 (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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