
G1000 System Maintenance Manual – Diamond DA40/40F Page 4-13
190-00545-01 Revision G
4.6 Fuel Tank Probe Re-Calibration
The G1000 in the DA40 uses digital fuel probes to provide fuel quantities. The fuel probes interface to
the GEA 71 where the data is received and sent to the displays for additional processing. In the PFD and
MFD, the raw fuel probe data is processed against a set of calibration points, in order to display an
accurate fuel indication. Due to the design of the fuel probes, the precise measurement of fuel quantity
varies from probe to probe. It is therefore necessary to have specific calibration points for the specific
probes installed in the aircraft.
NOTE
Although the total fuel quantity for long range tanks is 24 gallons usable fuel, the method
of fuel quantity processing in the DA40’s G1000 system only has a raw calibration total
of 20.95 gallons for the LEFT long range tank and 21.17 gallons for the RIGHT long
range tank when both probes are at their ceilings. However, this does not affect the
actual display to the pilot, which correctly shows 24 gallons on the MFD.
These calibration points allow precise display of fuel quantities at the low-to-empty end of the probes.
The EMPTY and 5 GAL points could be recalibrated as necessary by following this procedure, should the
fuel probe ever drift over time, or require replacement.
NOTE
It is MANDATORY to recalibrate a replacement fuel probe.
If the fuel quantity probe is replaced or is in need of adjustment, before proceeding with the re-calibration
procedures in this section the aircraft fuel calibration may possibly need to be reconfigured. This
requirement will apply to both standard and long-range fuel tanks.
1. If not already in configuration mode, restart the PFD in configuration mode by pulling, then
resetting, the PFD circuit breaker while holding the ENT key.
2. Go to the CAL Page Group on the PFD. The FUEL TANK CALIBRATION page should be
displayed.
3. FUEL TANK CALIBRATION page is not displaying the Calibration Table method as shown
in Figure 4-2, proceed to 4.6.1 to reload the Calibration Table fuel calibration files to enable
the Calibration Table method. Re-calibration of both tanks is necessary the first time the
calibration files are reloaded to upgrade to the Calibration Table method of fuel
calibration.
4. If the Calibration Table configuration is loaded as shown in Figure 4-2, proceed to 4.6.2 for
the fuel probe re-calibration procedure. Only the replaced fuel probe requires
re-calibration for this configuration.
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