(b)  
The quantity of fuel is shown digitally on the fuel quantity indicator found on the overhead panel, P5. The fuel quantity indicator has individual displays for each fuel tank and for the total fuel quantity. The fuel quantity indicator also shows the fuel temperature (Ref 28-43-00).

 (c)  
If the processor determines that there is unknown accuracy in a fuel quantity indicator, the individual indicator in the flight compartment and on the fueling control panel, P28, will go off. If this occurs during refueling, the message PUSH SET will show on the load select indicator. The total fuel quantity indicator on the P5 panel and on the flight management computer will also go off.

 (d)  
With the fueling station door open, the top half of the individual load select indicators show the quantity of fuel in their applicable fuel tanks.

 (5)  
FQIS Fueling Control

 (a)  
With power supplied to the FQIS and the load select control set to the quantity of fuel that is necessary, an analog signal proportional to that quantity, is sent to the FQIS processor. The processor digitizes the signal and stores it in memory. The processor also sends a digital signal of the same value to the load select indicator, to be shown on the bottom display. As the airplane is fueled, the fuel quantity is shown on the top display. When the selected quantity of fuel shown on the bottom display is reached, the fueling shutoff valves close for the applicable fuel tank.

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 28-41-00
 ú CONFIG ú 11 Page 29 ú Sep 28/00

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757
MAINTENANCE MANUAL

 (6)  
FQIS Fault Recovery

 (a)  
To read the faults kept in the processor you use the 32-character LED display and six buttons on the front face of the processor. The processor shows present and past faults. For past faults (shown in Fault History) there is an intermittent fault indication that shows the number of times the fault occured on a specific flight leg (maximum of 99) and if the fault occurred on the ground or in the air. When you read the Present Faults menu the Air or Ground indication is shown (intermittent fault data is not shown), indicating the fault occurred in the air or on the ground. When you read the faults from the Fault History menu, only the flight leg numbers for which faults were recorded will show. When you erase the fault history, only the flight legs 11 thru 64 are erased.

 NOTE: In the Fault History menu, flight leg 00 is the flight
____ leg you are currently on. Each flight leg starts at airplane takeoff.
 (7)  
　
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