(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.
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320飛機維護手冊 AMM WATER/WASTE 2(115)