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rain water from the door sills.
General Description
The waste disposal system has these subsystems:
* Gray water
* Vacuum waste
* Waste tank quantity indication.
Gray Water System
The gray water comes from the lavatory and galley sinks, and
from door sill drains at each entry and galley service door.
The gray water from the sinks drains overboard through drain
masts.
The gray water from the door sills drains overboard through
drain fittings.
Vacuum Waste System
The vacuum waste system removes human waste from the
toilets. The waste material is held in a waste tank until
servicing.
Waste Tank Quantity Indication System
The waste tank quantity indication system measures and shows
the level of waste in the waste tank.
Abbreviations and Acronyms
* ac - alternating current
* A/C - air conditioning
* BIT - built in test
* C - Celsius
* dc - direct current
* F - Fahrenheit
* FCU - flush control unit
* FWD - forward
* GND - ground
* LCM - logic control module
* mm - millimeter
* PSID - pounds per square inch differential
* REF - reference
* SEC - section
* SYS - system
* TYP - typical
* v - volts
WATER/WASTE - WASTE DISPOSAL - INTRODUCTION
EFFECTIVITY
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Purpose
The gray water system has these functions:
* Drains water and other liquids from the lavatory and galley
sinks
* Gives exhaust ventilation from the lavatories and galleys
* Drains rain water from the entry/service door sill areas.
General Description
The gray water system has these two subsystems:
* Waste water system
* Door sill drain system.
Waste Drain System
The waste water system collects the waste water from the
lavatory and galley sinks and drains the waste water overboard
through heated drain masts. The waste water system also gives
exhaust ventilation from the lavatories and galleys.
Door Sill Drain System
The door sill drain system collects rain water from the entry/
service door sill areas and drains the water overboard through
drain fittings.
Abbreviations and Acronyms
* A/C - air conditioning
* dc - direct current
* FWD - forward
* GND - ground
* PSID - pounds per square inch differential
* REF - reference
* SEC - section
* SYS - system
* TYP - typical
* v - volts
WATER AND WASTE - GRAY WATER SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 38-31-00
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WATER AND WASTE - GRAY WATER SYSTEM - INTRODUCTION
EFFECTIVITY
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Purpose
The waste water system collects the waste water from the
lavatory and galley sinks and drains the waste water overboard
through heated drain masts.
The system also gives exhaust ventilation for the lavatories and
galleys.
General Description
The waste water system has these components:
* Lavatory and galley sink drains
* Lavatory and galley sink drain vents
GUN 201-999
* Forward gray water drain valve
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* Drain hoses and lines
* Drain masts.
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The waste water drains overboard through the drain masts
when the airplane is on the ground and when the airplane is in
the air.
GUN 201-999
When the airplane is on the ground, the forward gray water
drain valve is open. Waste water in the forward waste water
system then drains through the forward gray water drain valve
　
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