(2)
 Remove the access platform(s).

 (3)
 Close the access panel 161DW, 162DW.

 (4) Close the AFT cargo compartment door (Ref. TASK 52-30-00-860-002). Subtask 38-31-76-862-050
 B. De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

 WASTE WATER DRAIN - DESCRIPTION AND OPERATION
_____________________________________________
 1. General
_______
 The waste-water drain system disposes of the waste water from the lavatory
 washbasins and the galley sinks.
 The system has:
 -washbasin drain assemblies in the lavatories and galleys,
 -
drain valves in the sanitary unit cabinets,

 -
drain lines and the heated drain masts.

 2.
 Component Location

__________________
 (Ref. Fig. 001)

 3.
 Description

___________
 **ON A/C 001-003, 051-052,
 (Ref. Fig. 002)
 A. Drain Assembly The lavatory washbasins have a drain valve assembly. This drain valve assembly has a valve body with drain and overflow connections. Optional is a control cable and control knob. The control cable connects the valve to the control knob.

R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 002A)
 A. Drain Assembly The lavatory washbasins have a drain valve assembly which is permanently open. This drain valve assembly has a valve body with drain connection. A hose connects the overflow at the top of the washbasin to the drain hose downstream of the drain valve assembly.
 **ON A/C ALL
 B. Drain Valve The drain valves, which are installed in the drain lines, have a valve body with inlet/outlet connections, and a diaphragm. The valves prevent leakage of cabin air through the drain lines. The valves also have a backflow prevention device.

R  Waste-Water Drain System - Component Location Figure 001
 1EFF : 1 1 1CES  ALL  1 111 38-32-00 Page 2 Nov 01/01

 Waste-Water Drain - Functional Diagram
 Figure 002

R 1EFF : 001-003, 051-052, 1 38-32-00Page 3 1 1 May 01/05 1 1 1CES 1

 Waste-Water Drain - Functional Diagram
 Figure 002A

R 1EFF : 004-049, 053-099, 101-149, 151-199, 1 38-32-00Page 4 1201-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 C. Drainmast

 Waste water is discarded to the outside through two drainmasts, which are installed on the lower fuselage shell (Ref: 30-71-00). A mixture of cabin differential pressure and gravity moves the waste water to the drainmasts. Each drainmast has a drain tube, integrated electrical heating-elements, and a flange for the installation of the drainmast.
 **ON A/C 051-051,
 The fwd cargo compartment drain system is connected to the drain system of the fwd lavatory/galley. Waste water from the lavatory/galley and the fwd cargo compartment drain system is discarded through the fwd drainmast 4DU. The aft cargo compartment drain system drains through the mid drainmast 24DU (Ref 30-71-00).
 **ON A/C ALL
 4. Operation_________
 **ON A/C 001-003, 051-052,
 A. Drain Assembly The lavatory washbasins have a drain valve assembly (which is installed on the bottom of the bowl) for the drainage of the waste water. The drain valve has a valve body with connections for drain lines and the sink overflow line. A plug which is installed in the drain valve assembly drains the waste water when it is pulled up. Optional Assemblys A control cable connects a poppet to a control knob on the back of the sink. You turn the knob to the right to close the valve and to the left to open the valve. A control rod system connects a poppet to a control knob on the washbasin. You pull the knob out to close the valve and push it in to open the valve.
 1EFF : ALL 1 38-32-00Page 5 1 1 Aug 01/05R 1 1 1CES 1

R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,

 A. Drain Assembly The lavatory washbasins have a drain valve assembly (which is installed on the bottom of the bowl) for the drainage of the waste water. The drain valve has a valve body with the connection for the drain line. The sink overflow is connected to the drain line downstream of the drain valve assembly. The drain valve is permanently open, a plug (which is installed in the drain valve assembly) allows the waste water to drain when you pull it out.
 **ON A/C ALL
 B. Drain Valve The drain valves, which are installed in the drain lines, open only when a certain amount of water is collected. This prevents a continuous leakage of cabin air. The backflow prevention device which is integrated in the drain valves prevents backflow of water through the out let side of the valves.
　
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