Oat Checks; Backup Gps Signal Check; Gsb 15 Connection Check - Garmin GI 275 Maintenance Manual

5.9.3

OAT Checks

5.9.3.1 ADI OAT Check
1. Power on all GI 275s in the system in Normal mode.
2. On the ADI page, navigate to the Misc. Field options (Menu → ADI Options → Misc. Field).
3. Touch the button that displays temperature and select OAT. Touch the OAT button to enable it.
4. Exit the menu and verify that OAT is displayed in the bottom-left of the ADI page.
5.9.3.2 MFD OAT Check
1. Power on all GI 275s in the system in Normal mode.
2. Navigate to the MFD Data page (Menu → Select Page → MFD Data or turn the outer knob).
3. Navigate to the MFD Data Options menu (Menu → MFD Data Options) and select the desired
air temperature reference units page to match the type specified in the POH/RFM:
a. OAT (Static) (static air temperature)
b. OAT (Total) (total air temperature)
4. Verify the correct units (Celsius or Fahrenheit) and temperature reference (static or total) are
displayed in the field.
5.9.4

Backup GPS Signal Check

This check is required for units configured as a Primary ADI, Standby ADI, HSI, and MFD (with the CDI
page) only if the VFR GPS is enabled and the antenna installed.
1. Power on the GI 275 system in Normal mode and verify that the rotorcraft has an unobstructed
view of the sky (or GPS repeater coverage).
2. Verify GPS1 and GPS2 (if equipped) are powered on.
3. Wait at least 5 minutes to allow GPS1, GPS2, and the VFR GPS to acquire a position.
4. Power off GPS1 and GPS2 (if equipped).
5. Verify message icon is annunciated on the top-left of the display.
6. Open the menu and touch Messages (Msgs). Verify that the message "VFR GPS is being used" is
present.
7. Verify ownship symbol is displayed on the map.
5.9.5

GSB 15 Connection Check

This check is required to test the connection if a GSB 15 is re-installed.
1. Power on all GI 275s in the system in Configuration mode.
2. Follow the Export Configuration procedure in Section 2.3.7 using the GSB 15.
3. When completed, remove the USB drive.
4. Insert a charging cable into the GSB 15 and connect it to a device. Ensure the device shows
charging.
190-02246-C2
Rev. 3
GI 275 Part 27 AML STC Maintenance Manual
Page 5-32