WATER QUANTITY INDICATION -COMPONENT LOCATIONS
Component Locations
There is a water quantity gage on the aft potable water service panel.
The water quantity summation unit is aft of the bulk cargo compartment end wall. It is on a passenger compartment floor beam.
There is a water level sensor that is part of each water tank.
There is a water quantity transmitter installed on a bracket near the forward side of each tank.
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WATER QUANTITY INDICATION -COMPONENT LOCATIONS
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WATER QUANTITY INDICATION -WATER QUANTITY GAGE
Purpose
The water quantity gage shows the quantity of water in the tanks.
Physical Description
The gage has these features:
*
Face with quantity amounts
*
Quantity indication arrow
*
Electrical connector.
Location
The gage is on the aft potable water service panel.
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WATER QUANTITY INDICATION -WATER QUANTITY TRANSMITTER
Purpose
The water quantity transmitter sends a signal to the water quantity summation unit.
Physical Description
The transmitter attaches to the transmitter mounting pad. The pad is part of the tank. The transmitter connects to the tank sensor through a terminal connector and a terminal screw.
The empty and full tank quantity adjustment screws are beneath an access plate on the transmitter.
Location
There is a transmitter installed on a bracket near the forward side of each tank.
Functional Description
The transmitter uses a capacitance-type water level senor to find the water level in the tank. The sensor is part of the tank. The transmitter gives a signal to the water quantity summation unit.
There are two water quantity sensor terminals on each mounting pad. The transmitter can connect to either terminal. The two terminals are in parallel. If one does not operate, the other one will not operate either.
Training Information Point
To adjust the transmitter, you must fill the tanks to full, then drain them, before you make adjustments. The inner surface of the tank must be wet to make an accurate calibration of the transmitter.
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WATER QUANTITY INDICATION -WATER QUANTITY TRANSMITTER
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WATER QUANTITY INDICATION -WATER QUANTITY SUMMATION UNIT
Purpose
The water quantity summation unit gets signals from the water quantity transmitters. It gives a water quantity signal to the water quantity gages and the CSS.
Location
The water quantity summation unit attaches to a beam above the water tanks.
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WATER QUANTITY INDICATION -FUNCTIONAL DESCRIPTION -INDICATION
Functional Description
The water quantity transmitters give water quantity data to the water quantity summation unit.
The summation unit calculates the total amount of water in the water tanks. This data goes to the water quantity gauge on the aft potable water service panel and to the cabin services system.
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WATER QUANTITY INDICATION -OPERATION -CSCP/CACP INDICATIONS
Operation
The CMS gives data on the potable water.
This data is on the cabin system control panel (CSCP) and the cabin area control panels (CACPs).
On the cabin controls main menu, select the water/waste status area. This causes the water/waste tank status menu to show. Then select the potable water status area. This causes the potable water status screen to show.
The potable water status screen shows the total amount of water in the tanks.
The quantity required for takeoff is a value set in the CSS configuration database. You can also use the CSS configuration database to make this area of the potable water status screen not show.
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