*
Cap
*
Lock handle
*
Inner door
*
Fitting, usual 4 inch (10.2 cm).
The rinse fitting assemblies have these components:
EFFECTIVITY
BEJ ALL
*
Cap
*
Lock handle
*
Fitting, usual 1 inch (2.5 cm).
Toilet Waste System Servicing
To drain, flush (rinse) and precharge the waste system you must do these tasks:
*
Open the waste drain cap
*
Connect waste drain hose to the waste drain fitting
*
Push the push-to-open lever on the waste drain valve assembly to open the inner door
*
Pull one of the T handles to empty the waste tank. Repeat this step for the other tanks.
*
Connect ground flush lines to the rinse fittings
*
Flush (rinse) each waste tank.
*
Drain each tank of the flushing liquid.
*
Push up each T handle to close the waste tank drain ball-valve
*
Wait one minute after pushing all T handles up then remove the waste drain hose from the waste drain fitting. This prevents liquid from freezing in the waste drain line.
*
Close the waste drain cap, the inner door latches close when you close the cap
*
Add a wet or dry precharge chemical to each waste tank.
*
Disconnect the ground flush lines, let the rinse fitting drain for one minute. This prevents liquid from freezing in the rinse line
*
Close the cap for the rinse fittings
*
Close the service panel.
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VACUUM WASTE SYSTEM -TRAINING INFORMATION POINTS -SERVICING
The rinse lines that connect the rinse fittings to the waste tanks and the waste tank drain lines that connect the waste drain valve to the waste tank ball valves are not heated. To prevent liquid from freezing in these lines, make sure you let the lines drain before you close the related caps.
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VACUUM WASTE SYSTEM -TRAINING INFORMATION POINTS -SERVICING
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777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
WASTE TANK QUANTITY INDICATION -INTRODUCTION
General
The waste tank quantity indication system gives data about the amount of waste in the tanks. It also stops power to the toilets if the waste tank is full.
These components are in the waste tank quantity indication system:
*
Waste tank point level sensors (6)
*
Waste tank continuous level sensors (3)
*
Logic control modules (LCM) (3).
Location
The point level sensors, the continuous level sensors, and the LCMs are in the bulk cargo compartment, behind the panels on the left side. The LCMs attach to the support fitting inboard of each waste tank.
The point level sensors attach to the upper part of the tanks. The continuous level sensors are in the tank drain lines. Each continuous level sensor has a remote diaphragm (not shown) in the vent line above the tank.
Interface
The waste tank quantity indication system gives data about the amount of waste in the tanks to the cabin services system (CSS). They also give tank full data to the lavatory flush circuit in the vacuum waste system.
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WASTE TANK QUANTITY INDICATION -INTRODUCTION
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WASTE TANK QUANTITY INDICATION -WASTE TANK POINT LEVEL SENSOR
Purpose
The waste tank point level sensor sends a signal to the LCM when the waste tank is full. There are six waste tank point level sensors, two on each waste tank.
Physical Description
The sensor is a capacitance type sensor.
It has an electrical connector.
Location
The sensors are behind the left side panels of the bulk cargo compartment. They are on the upper part of the waste tanks.
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WASTE TANK QUANTITY INDICATION -WASTE TANK CONTINUOUS LEVEL SENSOR
