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2.  Toilet Shroud Assemblies (Fig. 2)
A.  Each toilet tank shroud assembly consists of a standard commercial seat and cover attached to a shroud which covers the flushing components mounted on the tank top. The shroud is attached to the upper and lower ends of the shroud support angles.
3.  Toilet Flushing Components (Fig. 2)
A.  The flushing components include a flush handle, timer, flush motor and the required tubing.  The flush motor and tubing are on the tank top. The flush handle and timer are on the toilet back shroud above the toilet unit.
4.  Toilet Flush Handle
A.  The flush handle is rotated to start the timer for the flushing cycle.
5.  Toilet Timer
A.  The timer is an electrical solid state unit mounted behind the flush handle. Rotating the flush handle 15 degrees provides power to the flush motor for 10 +2 seconds.
B.  Every time the flush handle is operated, the electrical connection to the flush motor is reversed to reverse direction of rotation of the motor.
565 
Jun 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-32-0 Page 5 

6.  Toilet Flush Motor
A.  The flush motor consists of a motor, pump and filter unit assembly. This assembly is secured to the tank top by a mounting plate which is retained in position beside the toilet bowl by six mounting bolts.
B.  The motor drives the pump impeller by direct drive when the flush handle is activated (see Fig. 3 for electrical circuit). The impeller draws fluid from the toilet tank through a basket filter and pumps it to the toilet bowl.
C.  On motors with fixed filter, the tank flush inlet tube is mounted adjacent to the motor. During tank servicing, with water under pressure, the tube delivers rinse water to spray nozzles located within the perforated filter. The nozzles rotate and spray rinse water to the insides of the filter and toilet tank.
D.  On motors with rotating filter, the motor rotates the filter through a reduction gear train while driving the pump impeller. A stationary wiper blade clears the outer surface of the filter as it rotates.
7.  Toilet Tubing
A.  Tubing from the pump outlet connects to a flush ring attached to the toilet bowl. Nozzles on the flush ring direct a stream of liquid into the bowl.

F91475
Toilet Flushing System Circuit  565 
38-32-0  Figure 3  Jun 20/84 
Page 6 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

8. Toilet Waste Tank

A.  Each toilet waste tank assembly includes. The capacity of the forward lavatory compartment tank is 16 gallons and the aft lavatory compartment tank 17 gallons. The drain valve is operated by a cable from the toilet service panel. A rubber gasket is placed along the top edge of the tank to form a water tight seal when the tank top is installed. The hinged separator can be held open for limited access to the tank interior through the bowl.
B.  The drain valve, when fully open, permits unrestricted passage of waste from the tank to a service cart. In the closed position, it forms a positive seal. It is a spring-loaded self-closing valve and does not require lubrication. It is opened by pulling a handle on its related exterior service panel. When the handle is in the extended position, it can be rotated to latch it. A toilet drain plug, which is removed by means of a control on the service cart attachment, is installed in the drain tube. This drain plug is to prevent waste, which may have accumulated in the drain tube because of a faulty drain valve, from being suddenly discharged on the ramp when the drain cap is removed.
C.  The tank top is made of fiberglass. The flushing components and the toilet bowl are attached to the top. The tank top may be removed as a unit for maintenance of the flushing components.
D.  An overboard vent line is connected from the tank, through a muffler, to a fitting on the fuselage. A lavatory compartment vent line is also connected to the muffler.
E.  A vacuum vent line equalizes the pressure in the lavatory compartment, the waste tank, and the inside of the toilet bowl. Refer to Sink Cabinet Passenger Water System Components illustration, 38-11-0.
F.  On waste tanks with rotating filter, a cleansing spray ring beneath the tank top is connected to the ground flush line permitting flushing of the waste tank from the service panel. A check valve is in the spray tube inlet fitting on the tank prevents waste fluid from spilling into the ground flush line when the waste tank is full.
G.  On waste tanks with fixed filter, the check valve is mounted on an adapter which diverts water from the ground flush line to the tank flush inlet adjacent to the motor. The flushing water is then routed to spray nozzles within the filter (Ref par.6).
　
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