-
Starts the vacuum generator if the defferentail pressure signal is less than 203 mbar during descent.

 3 The DEU B:
_
 -
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.

 4 The DIR calculates and transmits the signal to the FAP:
_ -To show the level of the waste in the waste holding tank.
 5 When the limit switch on the waste service panel indicates
_ OPEN panel and the aircraft is on ground (CFDS):
 -
The DEU B stops all toilet operations and the flush signals are ignored

 -
The FAP message on the WATER/WASTE page VACUUM SYSTEM DISABLED-GROUND SERVICING is switched on.

 6 The DIR will not react on a single LG fault, because the DIR
_ BITE does not control the LG signal.
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 (b) Failure Mode

 1_ The DIR transmits the system defects to the ARINC 429 data
 bus.The DIR memorizes the defect signals for ground
 maintenance and inspection. These signals are:

 a The flush control unit defect:
_
 -The corresponding toilet operations is stopped.
 b 115 V AC power supply shutdown.
_
 c Vacuum generator (overheat) defect:
_
 -The vacuum generator will be disable after the third detection during one flight leg.
 2 The DIR will transmit and keep the defect data but the system
_ will operate normally if:
 -The LLT indicates a full tank and the LLS does not.
 3 The DIR 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 DIR will stop the system operation and the VACUUM SYSTEM
_ DISABLE ON GROUND message on the WATER/WASTE page on the FAP comes on if:
 -
The CFDS falsely indicate ON GROUND

 -
The service panel door falsely indicates door OPEN when the aircraft is in flight.

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 (3) Operation Mode - Sensor Failures
 (a)
 If the LLT does not operate:

 -The system will continue to operate (the VSC 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 VSC monitors the LLT to sense when the waste tank is full).

 (c)
 If the altitude pressure switch does not operate, the system will continue to operate as follows:

 -The LG signal is used to give the information ON GRROUND or IN FLIGHT
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 -On the ground the vacuum generator will operate
 -In flight the vacuum generator is inhibited.
 (d)
 If both the altitude pressure switch and the LG signal falsely indicate high altitude:

 -The vacuum generator will not work and the toilets will not flush on the ground. The toilets will however work at high altitude because of the cabin differential pressure.

 (e)
 If the LLT and the altitude pressure switch do not operate, the system will continue to operate as follows:

 -The LLS sends the signal tank full to the VSC.

 (f)
 If the LLS and the altitude pressure switch do not operate, the system will continue to operate as follows:

 -The LLT sends the signal tank full to the VSC.

 (g)
 Service Door Limit-Switch 44MG Failure (indicates door open)

 1 On the ground:
_ a The system will not operate
_
 b The SYS INOP and the LAV (X) INOP lights on the FAP are ON.
_
 2 In Flight:
_ a The system will however operate
_
 b In this situation the SYS INOP and the LAV (X) INOP lights
_
 will go OFF,

 c they will come ON again after the landing.
_
 (h) If the door limit switch 44MG does not operate (indicates door close):
 -
The system will operate on the ground and in the air as normal.

 -
The system will not be disable and you can flush the toilets during ground servicing.

 NOTE : If there are three or more sensor failures at one time the
____ system will not operate. But If the LLS and the LLT do not operate, the system will also not operate and the SYS INOP lamp on the FAP comes on.
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