**ON A/C 001-049, 051-051, 056-056,

 (Ref. Fig. 006, 007)
 A. Toilet Assembly 50MG
 (1)
 General The toilet assembly has a Flush Control Unit (FCU) which controls its operation. Potable water from the aircraft pressurized water system from between 1.72 bar (25 psi) to 1.93 bar (28 psi) flushes the toilet bowl. Differential pressure between the waste tank and cabin moves water and waste from the bowl to the waste holding tank.

 (2)
 Flush Control Unit (Ref. Fig. 008) The time and sequence of the different components is controlled through the Flush Control Unit (FCU), which controls the toilet flush cycle. The FCU BITE monitors the water valve, flush valve and internal control circuitry. If a fault is detected, it is transmitted to the VSC.

 (a) Flush Cycle Sequence (Ref. Fig. 008) The flush cycle starts when you push the flush switch, and the FCU starts the flush sequence as follows:
 -
The vacuum generator starts to operate after the operation of the flush switch, (on the ground and in flight below 16000 ft.) and stays on for approximatly 15 seconds

 -
The water valve opens 1.6 seconds after operation of the flush

 switch, and stays open for 1.7 seconds.
 In this time the toilet bowl is rinsed.

 -
The flush valve opens 2.2 seconds after operation of the flush

 switch, and it stays open for 4 seconds. The differential pressure now moves the waste from the toilet bowl into the waste holding tank. Above 4877 m (16000 ft.) altitude, the flush cycle will stay the same. But the vacuum system controller will remove the electrical power from the vacuum generator and stop the generator operation.
 (b) Double Flush In order to activate a second flush within the same flush cycle, the flush switch has to be pushed again. When the flush switch is pushed between 3 and 8 seconds after the first operation:
 -The water valve (rinse valve) will open (8 seconds after first operation of the flush switch) for 2.7 seconds
 -2.2 seconds later the flush valve opens for 4 seconds,
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 Vacuum System Control - Signal Interface
 Figure 006

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 DEU B - Signal Interface
 Figure 006A

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 INTENTIONALLY BLANK

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 Vacuum Toilet System - Electrical Schematic
 Figure 007 (SHEET 1)

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 Vacuum Toilet System - Electrical Schematic
 Figure 007 (SHEET 2)

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 Vacuum Toilet System - Electrical Schematic
 Figure 007A (SHEET 1)

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 Vacuum Toilet System - Electrical Schematic
 Figure 007A (SHEET 2)

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 Flush Control Unit - Schematic and Flush Cycle Sequence
 Figure 008

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 -The flush cycle is completed 10 seconds after the second operation of the flush switch.
 (c) Built-In Test Equipment (BITE) The BITE of the flush control unit finds the faults of the:
 -Water valve solenoid
 -
Flush valve motor

 -
Flush valve (valve open)

 -
Flush valve (valve closed)

 -
Flush control unit.

 NOTE : Faults found are transmitted from BITE to the VSC.
____
 **ON A/C 052-055,
 (Ref. Fig. 006, 007)
 A. Toilet Assembly 50MG
 (1)
 General The toilet assembly has a Flush Control Unit (FCU) which controls its operation. Potable water from the aircraft pressurized water system from between 1.72 bar (25 psi) to 1.93 bar (28 psi) flushes the toilet bowl. Differential pressure between the waste tank and cabin moves water and waste from the bowl into the waste holding tank.

 (2)
 Flush Control Unit (Ref. Fig. 008) The time and sequence of the different components is controlled through the Flush Control Unit (FCU), which controls the toilet flush cycle. The FCU BITE monitors the water valve, flush valve and internal control circuitry. If a fault is detected, it is transmitted to the VSC.

　
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