(e)  
Install hinge block and retaining nut.

(f)  
Install hinge pins, spring and handle.

(g)  
Open applicable water supply line manual shutoff valve.

C.  Press-to-Flow Type (SABRE P/N 600380-2) (Fig. 203)
(1)  
Determine if hot or cold valve is leaking (feel faucet assembly and dripping water for temperature).

(2)  
Remove Leaking Valve Cartridge

(a)  
Close applicable manual shutoff valve in water supply line.

(b)  
Lift faucet handle to vertical position.

(c)  
Apply wrench to hexnut, remove valve cartridge from body assembly.

(3)  
Install Replacement Valve Cartridge

(a)  
Install valve cartridge onto body assembly.

(b)  
Lower faucet handle to normal position.

(c)  
Open water supply line shutoff valve.

(d)  
Check that water flows normally from faucet.

(e)  
Check for leaks from faucet and cartridge.

532 
Jan 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-11-81 Page 203 

F90548
Press-to-Flow Valve Faucet Assembly38-11-81 Figure 203 Jan 20/83 Page 204

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

WASTE WATER SYSTEM - DESCRIPTION AND OPERATION
1.  General
A.  The waste water system disposes of all waste water from the lavatory and galley compartments. The system consists of plumbing necessary to drain the waste water overboard through the drain masts (Fig. 1).
2.  Lavatory Sink
A.  The lavatory sinks are made of stainless steel. Sink fixtures consist of spring-loaded hot and cold water valves with a common outlet, an overflow outlet, and a lever-operated stopper. The stopper is spring loaded to the closed position to reduce cabin pressure loss through the drain line.
3.  Lavatory Floor Drain
A.  A lavatory floor drain, located under the toilet tank in the lavatory, is provided for draining condensation and seepage from the lavatory area. It consists of a floor drain fitting, strainer, a check valve and hose (Fig. 2). The check valve allows moisture to drain into the toilet drain tube, but prevents objectionable odors and waste from entering the lavatory compartment.
4.  Waste Water Plumbing
A.  Waste water plumbing in the lavatory compartments is made of flexible plastic hose. (For specific material of any hose assembly refer to Boeing Illustrated Parts Catalog).
5.  Waste Water Drain Masts (Airplanes so equipped)
A.  The forward drain mast is on the underside of the fuselage in the left air conditioning fairing. The aft drain mast is on the underside of the fuselage just forward of the aft entry door (Fig. 1). The drain masts are designed to draw waste water out of the system while the airplane is in flight. The mast is normally anti-iced by warm cabin air from the toilet vent fittings and supplemented by electrical heating elements wrapped around the inner drain mast tube (Ref Chapter 30, Water and Toilet Drain Anti-Icing Systems).
5C8 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-31-0 Page 1 

F90812 F90874
Waste Water System Equipment Location  5C8 
38-31-0  Figure 1  Jun 20/85 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

592  Lavatory Floor Drain Location 
Aug 15/80  Figure 2  38-31-0 
Page 3 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

WASTE WATER - MAINTENANCE PRACTICES
1.  Lavatory Sink Cabinet Drain Lines
A.  General
(1)  
Water system drain lines are made of nylon tubing. Care should be exercised in handling them to avoid nicks, scrapes and abrasions.

(2)  
When installing sink cabinet drain lines, ensure that line has protective sleeving.

CAUTION:  IF PROTECTIVE SLEEVING IS NOT INSTALLED, CIGARETTES, WHICH ARE OCCASIONALLY EXTINGUISHED IN LAVATORY WASTE CONTAINERS, MAY CAUSE PLASTIC DRAIN LINE TO BURN.
2.  Waste Water Drain Line Unclogging
A.  General
(1)  The lavatory and galley drains are subject to clogging if debris and greasy material are introduced into the system. To prevent clogging, ensure that only freely flowing waste water is allowed into drains.
B.  Equipment
(1)  Flexible rotating cable (snake) (commercially available)
C.  Materials
(1)  Alkaline cleaner - ALTREX B (Ref 20-30-31) mixed with hot water to yield a six percent solution.
　
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