Gps Ground Checks - Garmin GI 275 Installation Manual

6.3.1

GPS Ground Checks

6.3.1.1 GPS Receiver Interface Check
This check is required for units configured as a Primary ADI, Standby ADI, HSI, and MFD with the CDI
page configured on.
NOTE
GPS satellite reception is required for the following steps.
1. Power on the GI 275 system in Normal mode.
2. Select GPS (or GPS1) as the CDI source.
a. ADI: Open the menu. Touch the System button, then the CDI button until "GPS" is displayed
in magenta.
b. HSI: Touch the CDI button until "GPS" is displayed in the top-left of the display.
c. MFD CDI: Touch the CDI button until "GPS" is displayed on the left side of the display.
3. ADI: Enable deviations (Menu → Options → Devs).
4. Verify the external GPS1 navigator is powered on and, if dual GPS navigators are installed, ensure
the second GPS navigator (GPS2) is powered off.
a. For a GNS 4XXW/5XXW series, GTN 6XX/7XX series, or GTN Xi series navigator, while
on the Power-up Self-test page, verify that the ADI displays the correct lateral and vertical
deviation information.
b. For a GNS 480 unit, while it is going through its power-up sequence, verify that the ADI
displays the correct lateral and vertical deviation information.
5. Continue in Normal mode after the self-test and wait until the navigator acquires a position before
proceeding.
6. Review the active alerts on the display (if any) and verify that there are no alerts, service soon, or
service required alerts associated with the GPS unit.
7. Create/activate a flight plan on the GPS navigation source.
8. ADI: Verify that the magenta diamond displays on the lateral deviation.
HSI: Verify that the magenta deviation bar displays in the center of the display.
MFD CDI: Verify that the magenta deviation bar displays in the center of the display.
a. If the MFD Data page is configured, navigate to it and verify that the waypoint in the Active
WPT field is the same as the one on the GPS navigator.
9. On the GPS navigator, enter OBS mode.
10. ADI: On the GI 275, access the course selection bug (Menu → Options → NAV Options → CRS
Options) and adjust the course using the inner knob.
HSI: On the GI 275, touch the Course button on the bottom-right of the display of the GI 275
(will illuminate cyan when selected) and adjust the course using the inner knob.
11. ADI: Verify that the course to the active waypoint changes as the display course pointer is rotated.
HSI: Verify that the course to the active waypoint changes as the display course pointer is rotated.
12. Exit OBS mode on the navigator.
13. If dual GPS receivers are installed, power off GPS1 and power on GPS2.
14. Select GPS2 as the CDI source and repeat steps 4 through 12.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 6-7