VACUUM WASTE SYSTEM -LAVATORY COMPONENT LOCATIONS

EFFECTIVITY BEJ ALL  38-32-00 
Page 13 
D633W101-BEJ  Jan 05/2002 

VACUUM WASTE SYSTEM -VACUUM TOILET ASSEMBLY

Purpose
The vacuum toilet assembly collects waste.
Physical Description
The vacuum toilet assembly has these parts:
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Rinse ring

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Toilet bowl

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Anti-siphon valve

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Rinse valve

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Flush valve

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Manual shutoff valve

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Manual shutoff handle

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Pedestal

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Manual shutoff valve handle

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Flush control module (FCM).

Location
A vacuum toilet assembly is in each lavatory. It is under the toilet shroud (not shown).
Functional Description
The rinse valve supplies potable water to the rinse ring. When the toilet flushes, the FCM opens the valve for 0.7 seconds and releases water. The rinse ring uses the water to rinse the toilet bowl.
The anti-siphon valve keeps water that is in the rinse ring and the toilet bowl out of the potable water system. This valve makes an air gap between the bowl and the potable water supply.
The flush valve keeps the flow path between the toilet bowl and the waste line closed. The valve opens to let waste move from the toilet bowl to the waste tank. The FCM controls the flush valve.
Training Information Point
If the flush valve fails in the open position, cabin pressure goes out through the vacuum waste system. To prevent this until the toilet is repaired, close the manual shutoff valve. Pull the handle that is below the toilet shroud to close the valve. Push the handle to open the valve.
The flush control module has a maintenance switch. You use this switch if you must keep the flush valve open during maintenance. Push the switch one time to open the flush valve. Push the switch again and hold it in for two seconds to operate the blower. The blower operates for ten seconds and then stops. Operate the toilet flush switch (not shown) to close the flush valve and return the toilet to usual operation.
EFFECTIVITY BEJ ALL  38-32-00 
Page 14 
D633W101-BEJ  Sep 05/2002 

VACUUM WASTE SYSTEM -VACUUM TOILET ASSEMBLY

EFFECTIVITY BEJ ALL  38-32-00 
Page 15 
D633W101-BEJ  Jan 05/2002 

VACUUM WASTE SYSTEM -WASTE TANK

Purpose
Waste tanks collect waste from the toilets.
Physical Description
Three 80 gallon (303 liters) waste tanks are on the airplane. The tanks hold 63 gallons (239 liters) of waste.
The waste tank is made out of composite materials and has a stainless steel inner liner. The tank has an opening and a cover at each end. The upper cover connects to two vent lines. The lower cover connects to tank drain line.
Two waste inlet fittings attach to the upper part of the tank. Two point level sensors and one rinse nozzle are attached to the inboard side of the tank. The rinse nozzle is above the point level sensors.
See the waste tank quantity indication section for more information on the point level sensors (SECTION 38-33).
The waste tank has a lower mounting ring. Bolts attach the mounting ring to the tank cradle.
Location
The waste tanks are in the bulk cargo compartment on the left side of the airplane.
Training Information Point
You use the service panel to drain and flush the waste tank before you remove it.
EFFECTIVITY BEJ ALL  38-32-00 
Page 16 
D633W101-BEJ  Sep 05/2002 

777 AIRCRAFT MAINTENANCE MANUAL

VACUUM WASTE SYSTEM -WASTE TANK

EFFECTIVITY BEJ ALL  38-32-00 
Page 17 
D633W101-BEJ  Jan 05/2002 

VACUUM WASTE SYSTEM -VACUUM BLOWER AND FILTER

Purpose When the airplane is below 16,000 feet, the vacuum blower
operates when you select the flush switch. The vacuum blower supplies suction for the waste system. The suction moves the toilet rinse water and its contents to the waste tank. The filter removes particles from the air that cools the blower motor.
Physical Description
The vacuum blower has these parts:
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Intake port

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Cooling air filter

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Exhaust port.

Location
Two vacuum blowers are in the aft cargo compartment on the left side. The vacuum blowers are forward of the waste tanks on a shelf.
Functional Description
The vacuum blowers cause a pressure difference large enough to move the waste from the lavatories to the waste tanks. The vacuum blowers operate if the airplane is below 16,000 feet. When the airplane is above 16,000 feet, the vacuum blowers do not operate. Lower pressure outside the airplane creates a vacuum.
　
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