Nav Ground Checks - Garmin GI 275 Installation Manual

6.3.1.2 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 aircraft 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.
6.3.1.3 Fuel Computer Check (GPS)
This check is required if the Fuel page is intended to be configured on an EIS display and a GPS source is
configured.
1. Power on the GI 275 system in Normal mode and verify that the aircraft has an unobstructed view
of the sky (or GPS repeater coverage).
2. Verify GPS1 is powered on and, if dual GPS navigators are installed, verify GPS 2 is powered off.
3. Wait approximately 5 minutes to allow the GPS navigator to acquire a position.
4. Navigate to the Fuel page (Menu → Select Page → Fuel or turn the outer knob).
5. Verify that all "Current" information on the display populates.
6. Create/activate a flight plan on the GPS navigator.
7. Verify that all "At Dest" information on the display populates.
6.3.2

NAV Ground Checks

6.3.2.1 NAV Receiver Check – ARINC 429
This check is required for units configured as a Primary ADI, Standby ADI, HSI, and MFD with the CDI
page configured on.
1. Power on the GI 275 system in Normal mode.
2. Verify the NAV1 receiver is powered on and, if dual NAV receivers are installed, verify the second
NAV receiver (NAV2) is powered off.
3. Select the NAV receiver as the CDI source.
a. ADI: Open the menu. Touch the System button, then the CDI button until "VOR" is displayed
in green.
b. HSI: Touch the CDI button until "VOR" is displayed in the top-left of the display.
c. MFD CDI: Touch the CDI button until "VOR" is displayed on the left side of the display.
4. Tune the NAV receiver to a localizer frequency (it is not necessary that a valid localizer signal is
being received).
5. Verify that the CDI on the GI 275 displays "LOC" (or "LOC1"/"LOC2" for installations with dual
navigators).
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 6-8