Version 16.10 AF-6600 AF-5000 Series Install Manual 202
The AF-6600 / AF-5000 EFIS stores two sets of calibration numbers for each tank. It uses
the ground calibration numbers when the Airspeed is less than 30kts. The flight calibration
numbers are used when the airspeed is greater than 30kts. This feature enables the fuel
gauges to read correct on the ground for a tail-wheel equipped airplane. If the aircraft does
not have a tail-wheel set the ground and flight data to the same calibration number.
It is important to understand that fuel level measurements are subject to the
physical limitations of the sensor. Depending on your fuel tank and sensor
geometry, there may be some immeasurable fuel at one or both ends of the fuel
level sensors’ range. The end result is that you may experience fuel readings at “full” that
are numerically less than the physical capacity of the tanks, and in this case you may also
see no apparent change in fuel level readings when the sensor is maxed out on the full
side. Similarly, on the empty side, you may see a zero quantity indication before the tank is
truly empty if the sensor has reached the bottom of its travel or measuring capability when
the tank still in fact has fuel in it. Most fuel tank sensors are mounted in the root of the
wing. If your wing has dihedral, it is common for the fuel tank sensor to stop
reading the fuel level at around 2/3 of a tank.
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