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compartment. You must remove the waste access panel to get
access to the drain line blockage removal valve. The drain line
blockage removal valve is in the rinse line between the waste
tank rinse filter and the rinse nozzles.
Physical Description
The drain line blockage removal valve has a body and a handle.
The body has three ports. The bottom port is the inlet for rinse
water from the waste tank rinse filter. The top port is the outlet
for rinse water to the rinse nozzles. The side port is the outlet to
the waste tank drain line fitting on the drain line elbow.
Operation
The handle lets you to put the drain line blockage removal valve
in one of these two positions:
* Normal
* Blockage removal.
Functional Description
The normal position lets rinse water flow to the rinse nozzles
during waste system servicing.
The blockage removal position lets rinse water flow to the drain
line elbow. The drain line elbow is the section of drain line
between the waste drain ball valve and the waste drain valve
assembly at the service panel.
Training Information Point
You use rinse water and the drain line blockage removal valve
to loosen a blockage in the waste drain line.
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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.
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WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM WASTE LINE CLEAN-OUT FITTING
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EFFECTIVITY
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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.
　
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