(2)
 Water Valve and screen (Rinse Valve) The water (rinse) valve is a solenoid controlled plunger type. It is connected electrically to the flush control unit. It has an integral water inlet fitting and a finger-type stainless steel-screen. The outlet of the valve is connected to the anti-syphon valve.

 (3)
 Anti-Syphon Valve The anti-syphon valve is installed above the toilet bowl and is connected to the water valve and the spray ring. It permits water to flow only in the direction of the spray ring and returns any back-water to the bowl.

 (4)
 Flush Valve (Rotary Gate Type) The flush valve is a motor operated gate valve. A duct connects the flush valve to the toilet bowl. The flush valve body is made of composite material and the rotary disc is made of stainless steel. The valve is fully open during the flush cycle. The waste flows through a 2.0 in. (50.8 mm) dia. tube. The rotary disc closes and seals the tube between the flush cycles. The flush control unit controls the flush valve operation.

 (5)
 Flush Control Unit The flush control unit is an electronic assembly installed on the supporting frame of the toilet assembly. It is connected electrically to the:

 -Flush switch
 -Water (rinse) valve
 -Flush valve
 -DEU B (CIDS).
R 1EFF : 106-149, 301-399, 401-499, 1 38-31-00Page 20 1 1 Aug 01/05 1 1 1CES 1 The FCU controls the time and sequence of the toilet operation during the flush cycle. Built-In-Test Equipment (BITE), monitors the operation of the water valve, flush valve and its internal control board circuitry. Faults are transmitted to the CIDS.

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 B. Vacuum Toilet System - Underfloor Components
 (Ref. Fig. 004)

 (1) Waste Holding Tank 3300MM The waste holding tank is installed on the right of the aircraft under the floor between FR65 and FR68. The tank has:
 -
A water separator

 -
A liquid level transmitter

 -
A liquid level sensor

 -The waste inlets

 -A waste outlet

 -Two rinse connections.
 The tank is a filament wound cylindrical vessel with a toilet waste
 capacity of 170 l (44.9 USgal).

 (a)
 Water Separator 3302MM The water separator is installed on the top of the waste holding tank and has an upper and a lower section. You must take the two sections apart for servicing of the filter in the lower section. The upper section has an air outlet for the vacuum line.

 (b)
 Liquid Level Transmitter 40MG The Liquid Level Transmitter (LLT) is installed in the bottom of the waste holding tank. It monitors the contents level in the waste holding tank and sends an analog signal to the Vacuum System Controller (VSC).

 (c)
 Liquid Level Sensor 41MG The Liquid Level Sensor (LLS) is installed in the upper section of the waste holding tank. It sends a signal to the Vacuum System Controller (VSC) when the tank is full. The VSC prevents further toilet flush operation.

R 1EFF : ALL 1 38-31-00Page 21 1 1 Aug 01/05 1 1 1CES 1

 Underfloor Components
 Figure 004

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 38-31-00Page 22 1201-299, 1Aug 01/05 1 1 1CES 1

 (2)
 Vacuum Generator 37MG The vacuum generator is installed on the right of the aircraft under the floor between FR68 and FR69. It is a self-contained centrifugal unit with thermal overload protection. The generator air inlet is connected to the water-separator air-outlet. The generator air outlet is connected to the aircraft overboard ventline. The generator gives the necessary differential pressure in the waste tank to move the waste from the bowl to the tank. The vacuum generator is electrically connected to the aircraft power-circuit.

 (3)
 Altitude Pressure Switch 43MG The altitude pressure switch is installed between FR71 and FR72. The switch is connected electrically to the Vacuum System Controller (VSC). It gives an electrical signal to the VSC which starts or stops the operation of the vacuum generator.

 (4)
 Vacuum System Controller 31MG The Vacuum System Controller (VSC) is installed on the right of the lower section of the fuselage between FR62 and FR63. The VSC is an electronic unit which has a Built In Test Equipment (BITE). The VSC is connected electrically to the aircraft power circuit. It is also electrically connected to:

 -
The flush control unit(s)

 -
The liquid level transmitter

 -
The liquid level sensor

 -
The altitude pressure switch

 -
The Forward Attendant Panel (FAP)

 -Centralized Fault Display System (CFDS) via ARINC 429 data bus. The VSC gives the CFDS failure data of the vacuum toilet system. The VSC also gives a RS 232-C interface for failure data for shop maintenance.
　
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