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38-32-00-005
Lavatory Flush Cycle Operation
The flush control unit (FCU) must receive an enable signal from
the logic control module (LCM) to operate the toilet assembly
components. The LCM sends an enable signal to the FCU when
the waste tank is not full.
If the FCU is enabled, the flush cycle will start with the operation
of the flush switch.
The flush control unit (FCU) controls the operation of these
components during the flush cycle:
* Vacuum blower
* Rinse valve
* Flush valve.
When you push the flush switch, the FCU immediately starts a
duty cycle inhibit. The duty cycle inhibit prevents another input
from the flush switch for the next 15 seconds.
The FCU also sends a signal to operate the vacuum blower. The
vacuum blower will operate if the airplane is below 16,000 feet
and the waste drain ball valve is closed. The FCU sends the
vacuum blower signal for 15 seconds.
One second after the flush cycle starts, the FCU opens the rinse
valve. The rinse valve is open for 0.7 seconds. During this time,
eight ounces of potable water goes into the toilet bowl. The FCU
then closes the rinse valve.
Two seconds after the flush cycle starts, the FCU opens the
flush valve. The flush valve is open for four seconds to drain the
toilet waste. The FCU then closes the flush valve.
The vacuum blower continues to operate for nine seconds. The
vacuum blower then stops.
The FCU is then ready for another flush cycle.
WATER/WASTE - VACUUM WASTE SYSTEM - FLUSH CYCLE
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WATER/WASTE - VACUUM WASTE SYSTEM - FLUSH CYCLE
WATER/WASTE - VACUUM WASTE SYSTEM - FLUSH CYCLE
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Location
These components are in the aft cargo compartment, left side,
behind the cargo lining:
* Waste tank
* Liquid separator
* Vacuum blower
* Vacuum check valve
* Waste drain ball valve and linkage assembly
* Waste drain valve assembly
* Waste tank rinse fitting assembly
* Waste tank rinse nozzles
* Waste tank rinse filter
* Drain line blockage removal valve.
The liquid separator is on top of the waste tank.
The vacuum blower and vacuum check valve are forward of the
waste tank. The vacuum blower and vacuum check valve are
behind the sidewall panels in the aft cargo compartment.
The waste drain ball valve is below, outboard, and forward of
the waste tank.
The waste drain valve assembly and the waste drain rinse
fitting assembly are on the waste service panel. You can access
the waste drain valve assembly and the waste drain rinse fitting
assembly from below the floor.
The waste tank rinse nozzles are on the top of the waste tank.
The waste tank rinse filter is along the inboard side of the waste
tank.
The drain line blockage removal valve is along the inboard side
of the waste tank.
Training Information Point
Before you work on the waste system, make sure that the waste
system servicing task is complete. Wear protective clothing.
WARNING: SEAL THE CARGO COMPARTMENT WITH THE
LINING. OBEY THE INSTRUCTIONS IN THE
SPECIFIED PROCEDURE WHEN YOU INSTALL
THE LINING. IF YOU INSTALL THE LINING
INCORRECTLY, THE FIRE EXTINGUISHING
AGENT OR SMOKE CAN GET INTO THE
PASSENGER COMPARTMENT DURING A FIRE.
WATER/WASTE - VACUUM WASTE SYSTEM - COMPONENT LOCATIONS - CARGO COMPARTMENT
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-32-00-002
WATER/WASTE - VACUUM WASTE SYSTEM - COMPONENT LOCATIONS - CARGO COMPARTMENT
WATER/WASTE - VACUUM WASTE SYSTEM - COMPONENT LOCATIONS - CARGO COMPARTMENT
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The waste tank holds waste material from the lavatory toilets.
Location
The waste tank is in the aft cargo compartment on the left side
of the airplane. You must remove the cargo lining to get access
to the waste tank.
Physical Description
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