(a)
The processor sends signals of low fuel, fuel configuration, and system faults to the EICAS computer. 1) The EICAS computer will supply and show a LOW FUEL caution
message and the FUEL CONFIG light will come on during this condition: a) When the quantity of fuel in either one of the two main
fuel tanks is less than 2200 pounds (1000 kgs). The message goes off when the quantity becomes more than 3000 pounds (1400 kgs).
2) The EICAS computer will supply and show a FUEL CONFIG advisory message and the FUEL CONFIG light on the P5 panel will come on during one of these conditions: a) A fuel imbalance of more than 1800 pounds (800 kgs)
between the left and right main fuel tanks.
b) Both center tank override switches in the off position with over 1200 pounds (500 kgs) of fuel remaining in the center fuel tank. The message and light are reset when the fuel remaining in the center fuel tank drops below 1000 pounds (400 kgs) or the center tank override switches are turned on.
(b) The processor sends a maintenance required signal to EICAS when the processor finds a fault. 1) These messages are shown:
a) FUEL QTY BITE (maintenance message) - Shown when one or more faults are recorded in the processor present faults. On processor S345N001-030, this message also shows when one or more faults are recorded in fault history. To show this message you must push the ECS MSG switch on the EICAS MAINT module (P61 panel).
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b) FUEL QTY CHANNEL (status message) - Automatically shown when the ARINC bus A or B becomes inactive. Only one of the two ARINC busses is necessary for FQIS operation. If the ARINC bus A becomes inactive, the last received value is shown until the processor switches to the ARINC bus B. This message will show when the processor has a fault in either channel with valid digital data. This message is inhibited by the FUEL QTY BITE status message.
c) FUEL QTY BITE (status message) - Shown in addition to the FUEL QTY BITE maintenance message if the EICAS computer does not receive valid ARINC data from the FQIS.
(4)
Indicator Signals
(a)
The processor calculates the weight of fuel in each fuel tank. The processor also calculates the total fuel quantity, by adding the quantity of fuel in each fuel tank.
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