CHAPTER
38
Water and Waste
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CHAPTER 38 Water and Waste
CH-SC-SU 38-42-00 38-42-00 38-42-00 Subject WATER TANK PRESSURIZATION -IN-LINE AIR FILTER WATER TANK PRESSURIZATION -FUNCTIONAL DESCRIPTION -CONTROL WATER TANK PRESSURIZATION -AIR FLOW -FUNCTIONAL DESCRIPTION Page 24 26 28 Effectivity BEJ ALL BEJ ALL BEJ ALL
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WATER AND WASTE -INTRODUCTION
General
The water system supplies potable water to the lavatories and galleys. The waste system keeps waste from the toilets and gives a way to remove it.
The potable water system has these subsystems:
*
Storage and distribution
*
Water tank pressurization
*
Water quantity indication
*
Water heating.
These subsystems are in the waste disposal system:
*
Gray water drain system
*
Vacuum waste system
*
Waste tank quantity indication.
Abbreviations and Acronyms
*
CACP -cabin area control panel
*
CPRSR -compressor
*
CSCP -cabin system control panel
*
CSS -cabin services system
*
FCU -flush control unit
*
INTLK -interlock
*
LCM -logic control module
*
SW -switch
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WATER AND WASTE -INTRODUCTION
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WATER AND WASTE -GENERAL DESCRIPTION
Potable Water System
There are two potable water tanks. The pneumatic system or a compressor pressurizes the tanks. The pressure inside the tanks pushes the water through distribution lines to the lavatories and galleys. Potable water also goes to the toilets in the lavatories to flush the vacuum toilet bowls.
Waste Disposal System
Gray water drains from the sinks in the lavatories and galleys. This gray water goes through drain lines to either of two drain masts on the bottom of the fuselage.
Each lavatory has a vacuum toilet. Waste lines connect the lavatories to one of three waste tanks. Each tank gets waste from a specified group of lavatories.
A vacuum in the tank pulls the waste from the toilet into the tank.
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WATER STORAGE AND DISTRIBUTION -INTRODUCTION
Purpose * Aft system drain valve
* Tank drain valve. The water storage and distribution system supplies potable water to the lavatories and galleys.
General Description
There are two water tanks that contain potable water.
You fill the tanks from aft potable water service panel. You use the fill/overflow valve to fill the water tanks. The overhead distribution line supplies water to the lavatories and galleys. There is a water supply shutoff valve in each lavatory and galley.
There is an isolation/drain valve in the forward part of the system and an isolation valve in the aft part of the system. These two valves let you isolate parts of the system. The isolation/drain valve also lets you drain the forward part of the system to the forward drain valve.
There is a water supply shutoff valve in each lavatory and galley. There is a drain valve in each lavatory. It lets water drain from the distribution lines in the lavatory. You use the galley faucet to drain the galley distribution lines.
These are the three drain valves that let you drain water from the distribution system and the water tanks:
* Forward system drain valve
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WATER STORAGE AND DISTRIBUTION -INTRODUCTION
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WATER STORAGE AND DISTRIBUTION -BULK CARGO COMPARTMENT COMPONENT LOCATIONS
Component Locations
These components are behind the bulk cargo compartment end wall:
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