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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The vacuum waste line clean-out fitting lets you clean a
blockage between the forward cargo compartment and the
waste tank.
Location
The vacuum waste line clean-out fitting is in the forward cargo
compartment. Remove the cargo compartment ceiling lining to
get access to the vacuum waste line clean-out fitting.
Functional Description
When the vacuum waste line clean-out fitting is removed, you
can put a plumbers snake or a kinetic air-ram equipment in the
vacuum waste line to remove the blockage.
Training Information Point
WARNING: MAKE SURE YOU ATTACH A DO-NOT-OPERATE
TAG TO THE TOILET FLUSH HANDLES FOR ALL
TOILETS IN THE SYSTEM. IF YOU FLUSH THE
TOILETS UPSTREAM OF THE BLOCKAGE, THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO EQUIPMENT.
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM WASTE LINE CLEAN-OUT FITTING
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38-32-00-021
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM WASTE LINE CLEAN-OUT FITTING
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM WASTE LINE CLEAN-OUT FITTING
EFFECTIVITY
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WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM WASTE LINE CLEAN-OUT FITTING
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Vacuum Toilet Assemblies
Operation of the flush switch sends a signal to the flush control
unit (FCU). The FCU opens the rinse valve to supply potable
water to flush the toilet bowl. After 0.7 seconds, the FCU closes
the rinse valve. Each rinse cycle uses eight ounces of potable
water. The FCU then opens the flush valve for four seconds to
let the toilet waste drain out of the toilet. The flush valve then
closes.
The anti-siphon valve prevents the vacuum waste system from
siphoning water from the potable water system.
The manual shutoff handle closes the manual shutoff valve.
Waste Tank Assembly
The waste tank collects the waste from the lavatory toilets.
Differential pressure causes the toilet bowl contents to flow
from the toilet to the waste tank. The vacuum blower or cabin
differential pressure supplies the differential pressure for the
waste tank.
The vacuum check valve prevents the pull of ambient air in from
the waste tank vent port by the vacuum blower.
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.
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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
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