Fuel - Garmin GI 275 Installation Manual

6. Complete the on-screen checklist. Touch each checklist item once completed. Once all checklist
items have a green check mark, touch the Back button.
7. Touch the Start Test button and follow the on-screen commands.
8. The GI 275 will power off automatically when the test is complete.
9. Power on the GI 275(s) in Configuration mode and verify a PASS was achieved by navigating to
the Backup Battery Test page and touching the Test Results button and then the Rundown Test
Results button.
10. For aircraft that are approved for flight over 25,000 feet, a rundown time of at least 60 minutes is
required to be considered a PASS. For aircraft that are only approved for flight at 25,000 feet or
less, a rundown time of at least 30 minutes is required to be considered a PASS.
5.8.3

Fuel

5.8.3.1 Fuel Quantity Calibration
The Fuel Quantity Calibration is performed in Configuration mode (EIS → Fuel → Quantity Cal or
Calibration/Test → Fuel → Quantity Cal). Ensure the settings on the Fuel page are configured.
CAUTION
Ensure the correct Fuel Quantity sensor configuration before calibration. If using a
GEA 24 with resistive fuel probes, the fuel quantity sensor must be configured as 0-5 Volt.
Refer to Appendix C.
This procedure is used to calibrate the GI 275 fuel quantity gauges. It begins with drained fuel tanks, then
unusable fuel is added, and then fuel is added in specified quantities during the fueling process. Tank
calibration takes time and cannot be interrupted once initiated. The Fuel Quantity Calibration procedure is
not required to be performed immediately following the setup of the fuel quantity gauge; however, it must
be completed before flight.
When determining the number of calibration points and amount of fuel to add at each, it is recommended
to take the total usable fuel capacity of each tank and divide it by a number of points that results in an
easily measurable amount of fuel to be added at each point (e.g., for a 24 GAL (of usable fuel) tank, divide
24 (gallons of usable fuel) by 6 (calibration points) to equal 4 (gallons of fuel to be added at each point).
Take that number of points (6 in this example) and add 1 more for the unusable fuel (Point 1). So, a tank
that holds 24 gallons of usable fuel could perform the calibration with 7 points, adding 4 gallons at each
point after the unusable fuel is added in the first point.
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GI 275 STC EIS & MFD Installation Manual
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