(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
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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
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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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