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 C.  The drain valve permits flow of the toilet tank waste to a service cart. The drain valve gives a positive seal when closed. It is a spring-loaded valve, primarily closed, that does not require lubrication. Pull the valve cable handle found on the service panel to open the drain valve. When the valve cable handle is in the extend position, you turn the handle to latch it. The drain plug found in the drain line is opened by an attachment on the service cart. The drain plug stops waste leakage because of a faulty drain valve. On some airplanes a ball valve and a flapper valve are installed in the drain line. The ball valve is installed in the drain line 4 to 6 feet above the forward service panel. The ball valve operates with the drain valve to permit flow of the toilet waste to a service cart. One valve cable handle operates both the ball valve and the drain valve at the same time. The valve cable is a push and pull type found between the service panel and the ball valve. The valve cable is a pull type found between the ball valve and the drain valve. The flapper valve found at the drain line outlet stops the waste leakage because of a faulty drain valve or a faulty ball valve. Open the flapper valve after you open the drain cap.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 D.  Three cleansing spray nozzles are mounted within the perforated filter. When connected to pressurized water source during servicing, the nozzles rotate and spray rinse water on the insides of the filter and tank.
 (1)  The spray tube in the auxiliary waste tank will flush the waste from the tank walls. The spray tube is connected to the ground flush fitting on the service panel.
 E.  A check valve, installed in the ground flush line, prevents air leakage and prevents waste fluid from entering the ground flush line. The valve is mounted on the tank top at the point where the flush line changes from tubing to flexible hose.
 F.  An overboard vent line is connected at the top of the tank and routed through a muffler to the overboard drain mast or to a vent nozzle on the skin of the airplane. A lavatory compartment vent line is also connected to the muffler.
 G.  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, 38-11-00, D&O.
 H.  The aft waste tank connects an added drain tube to the auxiliary waste tank. This drain tube drains the more than necessary waste to the auxiliary tank.
 9.  Auxiliary Toilet Waste Tank (Fig. 2)___________________________
 A.  The auxiliary tank is installed below the aft lavatory floor. The service panel connections and the drain valve for the auxiliary tank are located on the aft service panel. The auxiliary tank properties do not include the flush motor or the vent lines.
 10. Toilet Service Panels (Figs. 1 and 2)_____________________
 A.  Each toilet service panel includes one 4-inch drain valve, a flush line fitting, and a flush cable handle for each waste tank. The anti-ice feature for the waste drain valve on the aft service panel is supplied by a heating element in the drain gasket (Ref 30-71-00/001).
 B.  The service panels for the forward and aft toilet systems are on the airplane right side. The forward service panel is located right of the nose wheel well door. The aft service panel is located near the airplane centerline, forward of the APU access door.
 11. Toilet Operation________________
 A.  When the flush handle is rotated 15-degrees, it initiates toilet flushing by setting the toilet timer. The timer allows 115-volt ac power to the toilet flush motor for 10 (| 2) seconds. The flush motor operates the flush pump, which draws fluid through the filter, and pumps approximately 2-gallons of liquid through the toilet in each cycle. At the end of the cycle the motor stops and the liquid drains into the waste tank.
 B.  Drain the waste tank by (1) attach the service cart to the drain outlet,
 (2) open the flapper valve, (3) pull the drain valve handle located on the service panel. Use the flush connection on the service panel to flush the waste tank walls with pressurized water. The water enters the tank through spray nozzles that turn. The flush water will drain through the drain line.
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