S 862-028

 (2)  
Tighten or lossen the adjustment screw to get the necessary flow time.

 NOTE: The adjustment screw is found on the top of the faucet
____
 assembly.

 S 432-029
 (3)  Install the decorative cover.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

4.

5.

A
737-300/400/500MAINTENANCE MANUAL
 WASTE WATER SYSTEM - DESCRIPTION AND OPERATION
______________________________________________
General (Fig. 1)
_______
 A.  WASTE WATER SYSTEMS WITHOUT DRAIN MAST; the system will drain the waste water from the lavatory compartments. The system drains the waste water to the toilet tank.
 B.  WASTE WATER SYSTEMS WITH DRAIN MAST; The system will drain the waste water from the lavatory sinks and from the galley compartments. The system has the plumbing that is necessary to drain the waste water overboard thru the drain masts.
 C.  NON MODULAR LAVATORIES; the lavatory floor drain that is installed under the toilet tank is also a component of the waste water system.
 D.  MODULAR LAVATORIES; the moisture condensation and the water leakage from the toilet tank is collected in the enclosure for the toilet tank. Holes are made in the enclosure adjacent to the lavatory floor. The leakage from the holes give the indication that the waste water has collected and must be removed.
Lavatory Sink
_____________
 A.  The lavatory sink material is stainless steel. The sink has these properties:
 (1)  
A hot water valve and a cold water valve with a common output.

 (2)  
The opening located in the sink top edge will drain the sink water when the primary sink drain is blocked.

 (3)  
The mechanically operated blockage in the primary sink drain is spring loaded in the closed position.

 (4)  
On some airplanes, the water valves will shut off automatically

 10 to 30 seconds after you push the actuator.Lavatory Floor Drain (All except airplanes with modular lavatories - Fig. 2)
____________________
 A.  A lavatory floor drain in the catch basin under the toilet tank will collect condensation and leakage from the toilet tank area. It has a floor drain fitting, a strainer, a check valve, and a hose. The check valve in the hose allows the liquid to drain in the toilet drain tube and prevents the waste from entering the lavatory compartment.
Waste Water Plumbing
____________________
 A.  The waste water plumb lines in the lavatory compartments are flexible hose. (For specific material of any hose assemby, refer to Boeing Illustrated Parts Catalog.)
Waste Water Drain Masts (Fig. 1)
_______________________
 A.  Locate the forward drain mast on the bottom of the fuselage in the left air conditioning fairing. Locate the aft drain mast on the bottom of the fuselage forward of the aft entry door (Fig. 1). The drain masts will drain waste water from the system while the airplane is in flight. The primary anti-ice for the drain mast is the cabin air. The secondary anti-ice is the electrical heating elements wrapped around the inner drain mast line (AMM 30-71-00/001).
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 ALL  ú ú 07 Page 1 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

WASTE WATER
DRAIN LINE

Waste Water System Component Location Figure 1 (Sheet 1)
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 ú ú 27 Page 2 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

TOILET TANK VENT LINE
Waste Water System Component Location Figure 1 (Sheet 2)
　
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