Lru Description, Control, And Operation; Figure 2-3 Gi 275 Display; Figure 2-4 Backup Gps Antenna; Gi 275 Display - Garmin GI 275 Maintenance Manual

2.4 LRU Description, Control, and Operation

2.4.1

GI 275 Display

The GI 275 is a multi-function electronic instrument display. The GI 275 can be configured as a Primary
ADI, HSI, MFD/Standby ADI, HSI/Standby ADI, or MFD. The GI 275 ADAHRS variant includes an

integrated ADAHRS.

2.4.2

Backup GPS Antenna

The GI 275 has an internal VFR GPS receiver that may be used as a primary GPS source for VFR
navigation only or as a backup GPS. If the backup GPS antenna is installed, the internal VFR GPS is
automatically used when the primary GPS source is unavailable. The GI 275 backup GPS antenna is
installed on the instrument panel glareshield. Only one antenna is required for all installed GI 275s in the
system. GPS data will be forwarded from the GI 275 directly interfaced to the GPS antenna.
2.4.3 Integrated ADAHRS
The GI 275 ADAHRS variant has an integrated ADAHRS that provides altitude, vertical speed, airspeed,
attitude, OAT, and heading data for flight instrumentation. The internal ADAHRS receives data from the
GMU 44B, GTP 59, and pitot-static system. The integrated ADAHRS utilizes GPS signals sent from the
internal VFR GPS or an external GPS/SBAS source. Attitude, heading, and air data can be sent to external
LRUs via ARINC 429.
190-02246-C2
Rev. 3

Figure 2-3 GI 275 Display

Figure 2-4 Backup GPS Antenna

GI 275 Part 27 AML STC Maintenance Manual
Page 2-12