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 E.  The processor transmits excitation signals to and reads signals from the tank units, the compensators, and the densitometer. The processor uses this data to calculate the fuel volume and weight. The processor includes its own failure monitoring, and built-in test equipment (BITE). Fault isolation is supplied for all sensors and the fuel quantity indicator. Faults are kept in a non-volatile memory, for recall on demand by the maintenance crew. The processor supplies these outputs:
 (1)  
Signals to EICAS and the FUEL CONFIG light to warn of low fuel, fuel imbalance or fuel in the center fuel tank with the fuel override pumps off, or system faults.

 (2)  
Digital fuel quantity (primary and total) shown on the fuel quantity indicator module (FQIM) on the overhead panel, P5.

 (3)  
Digital fuel load selected, shown on the load select indicators (LSI's) on the fueling control panel, P28.

 (4)  
Volumetric and fuel quantity shutoff signals sent to the fueling shutoff valves for automatic shutoff.

 F.  
The tank units and compensators are almost the same in construction and installation provisions. Both tank units and compensators are capacitance type sensors but the tank units sense the height of fuel in the tank and the compensators measure the dielectric constant of the fuel.

 G.  
The densitometer senses fuel density. Knowing the density and the volume of fuel lets the processor calculate the mass or weight of the fuel.

 H.  
A FUEL QTY test switch makes sure the flight compartment displays including EICAS messages can operate. This switch only does a check of the displays and does not show the condition of the FQIS system.

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 2. Component Details
_________________
 A. Tank Units (Fig. 2)
__________
 (1)  
There are 12 tank units in each main fuel tank, and 9 tank units in the center fuel tank. All the tank units are the same, except for their length. The length depends on the depth of the tank at that particular location.
　
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