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Waste System Servicing
You service the waste tank from the waste service panel.
Attach the waste drain hose to the waste drain valve and open
the waste drain ball valve.
When the tank is empty, attach the rinse hose to the waste tank
rinse fitting. Then pressurize the rinse water supply. Rinse
water flows through the waste tank rinse filter and two rinse
nozzles.
The waste tank rinse nozzles spray water on the inside of the
tank to clean the point level sensors and waste tank.
Add chemical precharge after the waste tank is fully drained
and flushed.
The waste drain ball valve proximity switch stops the operation
of the vacuum blower when the waste drain ball valve is open.
You use the drain line blockage removal valve to remove a
blockage in the waste tank drain line. Rinse water flows to the
drain line elbow and pushes the blockage out of the drain line.
Interfaces
The FCU must receive an enable signal from the logic control
module (LCM) to operate the toilet components. The LCM
disables the FCU if the waste tank is full. The LCM monitors the
two point level sensors to find if the waste tank is full.
WATER/WASTE - VACUUM WASTE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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If the FCU is enabled, a flush cycle starts with the operation of
the flush switch.
The flush switch sends a signal to the FCU. The FCU then sends
a signal to operate the vacuum blower for 15 seconds. The
signal goes through the waste drain ball valve proximity switch
and the vacuum blower barometric switch. The waste drain ball
valve proximity switch and vacuum blower barometric switch
must be closed for the vacuum blower to operate.
The waste drain ball valve proximity switch is closed when the
waste drain ball valve is closed.
The barometric switch is closed when the airplane is below
16,000 feet.
Training Information Point
The waste tank must be flushed at each servicing interval. If the
waste tank is not serviced correctly, unwanted waste material
can collect on the point level sensors. The waste material on the
point level sensors can cause a tank full signal and stop
operation of the lavatory toilets.
You should flush crushed ice down the toilets at regular
intervals. The crushed ice will help to prevent unwanted
material from collecting in the vacuum waste lines.
CAUTION: DO NOT USE ICE CUBES AS AN ALTERNATIVE TO
THE CRUSHED ICE. ICE CUBES CAN CAUSE
DAMAGE TO THE POINT LEVEL SENSORS IN
THE WASTE TANK.
There is a clean-out fitting in the forward vacuum waste line.
You can use the clean-out fitting to clean a blockage between
the waste tank and the forward lavatory.
WATER/WASTE - VACUUM WASTE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-32-00-018
WATER/WASTE - VACUUM WASTE SYSTEM - FUNCTIONAL DESCRIPTION
WATER/WASTE - VACUUM WASTE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 38-32-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-32-00-018
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The waste tank quantity indication system measures and shows
the quantity of waste in the waste tank.
General
These components are in the waste tank quantity indication
system:
* Waste tank point level sensor (2)
* Waste tank continuous level sensor
* Logic control module (LCM)
* Waste quantity indicator.
The waste tank quantity indication system does these functions:
* Monitors and shows the level of waste in the waste tank
* Stops operation of the toilets when the waste tank is full
* Gives indication when the lavatories stop operation for
waste tank full condition
* Gives indication when the sensors are dirty
* BIT.
Abbreviations and Acronyms
* ac - alternating current
* BIT - built in test
* C - Celsius
* dc - direct current
* F - Fahrenheit
* FCU - flush control unit
* FWD - forward
* LCM - logic control module
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