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When the tank is almost full, the CACPs and CSCP show a pop-up screen to tell the flight attendants. The waste tank status screen on the CACPs and CSCP show full. A chime sounds when a waste tank is full.
Control
The LCM gets data from the two point level sensors.
Normally, the flush module power relay is energized. It lets power to go to the lavatories.
When both point level sensors give a signal that the waste tank is full, the flush module power relay de-energizes. This removes power from all toilets that connect to the full tank. A pop-up screen shows on the CSCP/CACP.
If a sensor has an error, it gives the same signal that it does when the tank is full. When the other sensor finds that the tank is full the flush module power relay de-energizes.
If both sensors have errors, the LCM removes power to the related lavatories is removed.
Interface
The LCM sends signals to an overhead electronics unit (OEU) (not shown). The OEU sends the signal to a zone management unit (ZMU) (not shown) on the OEU bus. The ZMU sends a signal to the CACPs on the CACP bus and to the CSCP on the intersystem (I/S) bus.
See the cabin services system section for more information on the OEU, CACP and the intersystem buses (SECTION 23-39).
Power
The ground service bus or the left main bus must have power for the LCM to operate.
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WASTE TANK QUANTITY INDICATION -FUNCTIONAL DESCRIPTION

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WASTE TANK QUANTITY INDICATION -OPERATION -CSCP/CACP INDICATIONS -1

General
You use the cabin system control panel (CSCP) or cabin area control panels (CACP) to control and monitor lavatory functions and waste tank levels.
Lavatory/Waste Tank Status Screen
You use the lavatory waste tank status screen to monitor the conditions of the lavatories and waste tanks.
The lavatories area of the screen shows lavatory locations and status. The area to the right of the lavatories shows the related waste tank and the amount of waste in it.
When the waste level is less than 1/4, the vertical bars are green. When the waste level is 1/4 to 3/4 full, the vertical bars are yellow. When the waste level is more than 3/4, the vertical bars are red.
When the waste tank level shows full (F), all related lavatories show INOP.
Lavatory Inoperable Control Screen
You use the lavatory inoperable control screen to show the conditions of the lavatories.
The screen shows the lavatories and assigned waste tanks. The status area of the screen shows the condition of each lavatory.
You touch OP or INOP to show that lavatory operational or inoperative. The OP and INOP selections show green.
INOP shows automatically for all lavatories with the same waste tank if the waste tank is full. FULL TANK shows in the area where OP would normally be. You cannot change this condition.
Use the up and down arrows at the right of the display to scroll the lavatory information up and down.
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WASTE TANK QUANTITY INDICATION -OPERATION -CSCP/CACP INDICATIONS -1

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WASTE TANK QUANTITY INDICATION -OPERATION -CSCP/CACP INDICATIONS -2

General
The waste tank full pop-up screen automatically comes on when a waste tank is full.
Touch the WASTE TANK STATUS to exit this screen and go to the waste tank status screen.
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WASTE TANK QUANTITY INDICATION -OPERATION -CSCP/CACP INDICATIONS -2

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777 AIRCRAFT MAINTENANCE MANUAL

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

WATER TANK PRESSURIZATION -INTRODUCTION

Purpose
The water tank pressurization system pressurizes the potable water tanks for distribution.
General Description
Pressure for the water tanks comes from the pneumatic system or from a compressor. The air compressor supplies pressure to the tanks when pressure from the pneumatic system is not sufficient.
These components control the amount of pressure that goes to the tanks:
*
Pressure relief valve

*
Pressure limit switch

*
Pressure regulator

*
Compressor interlock switch.
　
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