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D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The vacuum waste system removes human waste material
from the toilets and holds it in the waste tank.
General Description
The vacuum toilet collects human waste. A flush cycle puts the
waste material into the vacuum waste tubing.
Cabin pressure pushes the material to the vacuum waste tank.
There are two sources that cause low pressure (vacuum) in the
tank:
* The vacuum blower
* Cabin-to-ambient pressure differential.
The waste is kept in the waste tank until servicing. Servicing is
done at the waste service panel.
The vacuum waste system has these components:
* Toilet assembly
* Waste tank
* Liquid separator
* Waste tank rinse nozzle
* Waste tank rinse filter
* Waste tank rinse fitting assembly
* Waste drain valve assembly
* Waste drain ball valve
* Drain line blockage removal valve
* Vacuum check valve
* Vacuum blower
* Vacuum blower barometric switch.
Abbreviations and Acronyms
* ac - alternating current
* C - Celsius
* dc - direct current
* F - Fahrenheit
* FCU - flush control unit
* FWD - forward
* LCM - logic control module
* REF - reference
* TYP - typical
* v - volts
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Component locations
There is a toilet assembly and flush switch in each lavatory.
Training Information Point
To get access to the flush switch, you must first remove the
flush switch cover. You then remove the collar.
The toilet assembly is behind the toilet shroud. You must
remove the toilet shroud to get access to the toilet assembly.
The toilet shroud has a seat and cover. There is a cutout for the
toilet manual shutoff valve handle on the lower part of the
shroud.
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Purpose
The flush switch starts the flush cycle for the vacuum waste
system.
Location
Each lavatory has a flush switch adjacent to the toilet assembly.
You must remove the flush switch cover and the collar to get
access to the switch.
Physical Description
The flush switch is a momentarily closed switch.
Functional Description
The flush switch controls the vacuum waste system flush cycle.
The flush switch sends a signal to the flush control unit on the
toilet assembly.
WATER/WASTE - VACUUM WASTE SYSTEM - FLUSH SWITCH
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