(5)
 Check Valve 3320MM (vacuum pressure) The check valve is installed in the waste holding tank air outlet-line and parallel to the vacuum generator line. It lets air flow from the tank to the overboard vent line and stops opposite airflow.

 (6)
 Check Valve 3322MM/3323 (tank rinse line) The check valve is installed in the rinse line of the waste holding tank. It lets water flow in one direction only. There are two rinse inlets on the upper side of the tank which are equipped with one check valve each.

 (7)
 Waste Drain Valve 3340MM The waste drain valve is installed in the waste holding tank drain line. It is a ball type manually operated shutoff valve.

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 B. Vacuum Toilet System - Underfloor Components
 (Ref. Fig. 004A)

 (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 a signal to the CIDS System.

 (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 CIDS system when the tank is full to prevent further toilet flush operation.

 (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:

 -On the ground
 -In flight at low flight altitude. The vacuum generator is electrically connected to the aircraft power-circuit and is controlled though the DEU B and the DIR 1-2.
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 Underfloor Components
 Figure 004A

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 (3)
 Check Valve 3320MM (vacuum pressure) The check valve is installed in the waste holding tank air outlet-line and parallel to the vacuum generator line. It lets air flow from the tank to the overboard vent line and stops opposite airflow.

 (4)
 Check Valve 3322MM/3323 (tank rinse line) The check valve is installed in the rinse line of the waste holding tank. It lets water flow in one direction only. There are two rinse inlets on the upper side of the tank which are equipped with one check valve each.

 (5)
 Waste Drain Valve 3340MM The waste drain valve is installed in the waste holding tank drain line. It is a ball type manually operated shutoff valve.

 (6)
 Not Applicable

 (7)
 Not Applicable

 **ON A/C ALL
 C. Toilet Service Panel (Ref. Fig. 005) The service panel is installed on the right of the lower fuselage between FR65 and FR66. The panel is for the forward and aft toilets. The panel has:
 -
A waste holding tank drain connection

 -
A waste holding tank rinse connection

 -An actuation unit for the waste drain valve

 -A limit switch 44MG.
 A placard is installed on each of the connections to identify operation
 and use. To close the service panel door, the drain handle and blanking
 caps must be in the closed position.

 5. Operation
_________
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 Toilet Service Panel Figure 005 
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