*
Lets the hose from the service truck connect to the waste drain system.
Location
The valve assembly attaches to the waste service panel. The service panel is in the aft lower left part of the fuselage, aft of the bulk cargo door.
Physical Description
The valve assembly has these parts:
*
Push-to-open lever
*
Drain cap
*
Lock handle
*
Inner door
*
Fitting.
The push-to-open lever is part of a latch mechanism (not shown) that holds the inner door in the closed position. The latch mechanism and the lever are spring loaded to the latch close position. You use the lever to release the latch.
The drain cap has one of the two backup seals that prevents leakage from the waste tanks. The cap has a hinge that attaches to the base of the valve assembly.
The lock handle is part of the drain cap. The handle holds the drain cap in the closed and sealed position.
The inner door (flapper valve) has the second backup seal that prevents leakage from the waste tanks. The door is spring loaded to the open position. A latch mechanism (not shown) holds the door in the closed and sealed position.
The fitting is a standard 4 inch (10.2 cm) nipple style. The fitting lets you connect a waste drain hose to the lavatory waste tank drain system.
Operation
You use the lock handle to unlock and open or to close and lock the drain cap. You push on the push-to-open lever to open the inner door. The inner door latches to the close position when you close the drain cap. The drain cap has a raised area on the inside that pushes the inner door closed.
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VACUUM WASTE SYSTEM -WASTE DRAIN VALVE ASSEMBLY
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VACUUM WASTE SYSTEM -WASTE TANK RINSE FITTING ASSEMBLY
Purpose
The waste tank rinse fitting assembly supplies routing for supply water to rinse the waste tanks.
Physical Description
The waste tank rinse fitting assembly is made of stainless steel. The rinse cap has a rubber seal. This seals the fitting when closed.
Location
Three waste tank rinse fitting assemblies are in the waste service panel.
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VACUUM WASTE SYSTEM -WASTE TANK RINSE FITTING ASSEMBLY
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VACUUM WASTE SYSTEM -WASTE TANK RINSE FILTER
Purpose
The waste tank rinse filter removes small particles as the rinse water goes through it.
Location
The filter is in the bulk cargo compartment on the left side. The filter is between the waste tank rinse fitting assembly and the rinse nozzle. There are three filters. One is inboard of each waste tank.
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VACUUM WASTE SYSTEM -WASTE TANK RINSE FILTER
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VACUUM WASTE SYSTEM -WASTE TANK RINSE NOZZLE
Purpose
The waste tank rinse nozzle points rinse water at the point level sensors and the waste tank interior surface. The rinse nozzle removes waste material from the point level sensors. The rinse nozzle also supplies precharge into the waste tanks.
Physical Description
The nozzle has an inlet and rotating cylinder with a shaft. The nozzle inlet is stainless steel. The rotating cylinder and shaft are teflon-filled nylon.
Location
The rinse nozzle attaches to the waste tank. The rinse nozzle is near the top of the waste tank on the inboard side.
Functional Description
The rinse water goes in the inlet and out the rotating rinse nozzle. The nozzle has ports that point the rinse water at the point level sensors.
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VACUUM WASTE SYSTEM -WASTE TANK RINSE NOZZLE
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VACUUM WASTE SYSTEM -FLUSH CYCLE -FUNCTIONAL DESCRIPTION
Lavatory Flush Cycle Operation
One second after you push the flush switch, the rinse valve opens. The rinse valve stays open for 0.7 seconds. Eight ounces of potable water goes into the toilet bowl during this time. Two seconds after the flush cycle starts, the flush valve opens. The flush valve opens for four seconds then closes.
There is no flush cycle if the tank ball valve is open or if the related waste tank if full.
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