(3)
Digital fuel load selected, shown on the load select indicators on the fueling control panel, P28.
(4)
Volumetric and fuel quantity shutoff signals sent to the fueling valves for automatic shutoff.
F.
The tank units and compensators are similar in construction and mounting provisions. Both units 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 enables the FQPU to calculate the mass or weight of the fuel.
H.
A FUEL QTY test switch checks that the flight compartment displays including EICAS messages are operable. This switch only checks the displays and does not indicate the condition of the FQIS system.
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MAINTENANCE MANUAL
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R MAIN TANK
Fuel Quantity Indicating System (FQIS)Figure 1 (Sheet 2)
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2. Component Details
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A. Tank Units (Fig. 2)
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(1)
There are 12 tank units in each main fuel tank, and 9 units in the center fuel tank. All tank units are the same, except for their length. This depends on the depth of the fuel tank at that particular location.
(2)
Each tank unit consists of two concentric aluminum tubes, a terminal block, cable clamp, two end caps, and two mounting brackets.
(a)
The aluminum tubes are anodized and varnished to protect against corrosion. The tubes are factory calibrated by off-centering the center tube with color coded teflon spacers. The distance between the tubes is relatively widely spaced to avoid electrical short circuiting, due to water in the fuel and/or fungus coating on the tubes.
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