Calibration; Attitude/Heading; Autopilot Calibration; Analog Nav Calibration - Garmin GI 275 Maintenance Manual

5.12

Calibration

This section provides guidance for calibrating the GI 275 system if the previous calibration has become
invalid.
5.12.1

Attitude/Heading

If it becomes necessary to re-calibrate any installed AHRS, refer to the calibration procedures contained in
Section 5 and Section 6 of GI 275 Part 23 AML STC Installation Manual (P/N 190-02246-10).
5.12.2

Autopilot Calibration

If it becomes necessary to re-calibrate the autopilot, refer to the calibration procedure contained in GI 275
Part 23 AML STC Installation Manual (P/N 190-02246-10).
5.12.3

Analog NAV Calibration

If it becomes necessary to re-calibrate the Analog NAV, refer to the calibration procedure contained in
Section 6 of the GI 275 installation manuals (refer to Table 1-1).
5.12.4

Fuel Level Calibration

If it becomes necessary to re-calibrate the fuel level, refer to the calibration procedure contained in the
GI 275 installation manuals (refer to Table 1-1).
5.12.5

Backup Battery Check

This procedure will analyze the voltage and discharge qualities of the installed backup battery. The
procedure is required to be completed on initial installation and every 12 calendar months when a backup
battery is installed in the system. A fault indication message will be displayed in Normal mode until this
procedure is completed.
NOTE
The battery rundown test may take up to 150 minutes to complete.
NOTE
The battery rundown test date is reported in UTC.
To complete the backup battery test, complete the following steps:
1. Power on each GI 275 with an installed backup battery in Configuration mode.
2. Navigate to the Backup Battery Test page (Calibration/Test → Backup Battery Test).
3. Touch the Before Test Checklist button.
4. Verify that "Discharging" is not displayed under Battery State.
5. Touch the Test Date button and enter the current date.
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 completed.
9. Power on the GI 275(s) in Configuration mode and navigate to the Backup Battery Test page.
190-02246-11
Rev. 1
GI 275 Part 23 AML STC Maintenance Manual
Page 5-34