Unit Configurations - Garmin GI 275 Pilot's Manual

To act as an attitude indicator, the basic MFI must have an external AHRS source. To display
air data, the basic MFI must have an external air data computer. To show magnetic heading,
all MFIs must have an external magnetometer.
The basic version with an NVIS friendly encoder halo light is available, which provides the
'green' tint backlit knob
With Internal ADAHRS (Air Data and Attitude and Heading Reference System)
The MFI with internal ADAHRS can do everything the basic MFI does and additionally
contains its own air data and AHRS source, as well as interface to Garmin's fixed wing GFC
500 or GFC 600 autopilot, saving weight and expense.
An ADAHRS version with an NVIS friendly encoder halo light is available, which provides
the 'green' tint backlit knob.
With Internal ADAHRS and Autopilot Interface
For fixed wing installations, the MFI with autopilot interface expands the MFI with internal
ADAHRS capability and has interfaces to connect to an external autopilot or AFCS, letting the
MFI provide heading/course error and attitude to compatible autopilot and AFCS devices.

UNIT CONFIGURATIONS

Primary ADI
A Primary ADI replaces the traditional attitude indicator. It may additionally show airspeed,
altitude, vertical speed, and heading. Terrain is displayed with the optional SVT enablement.
Standby ADI or MFD
Standby ADI or MFD units provide additional capability to the aircraft and display
information (e.g., maps) or external data (e.g., radar altimeter). Standby ADI units act as a
backup ADI if the Primary ADI fails or the pilot reverts the display.
Primary HSI
The Primary HSI displays course deviation information based on the selected NAVAID. An
HSI Map shows course deviation information overlaid on a map centered around the aircraft's
current GPS position.
Standby HSI
The Standby HSI acts as a Primary HSI under normal conditions but as a backup ADI if a
Primary ADI fails.
EIS
For fixed wing installations, EIS units replace traditional mechanical engine instruments and
additional information like engine temperatures and provide features like engine lean assisting.
190-02246-01 Rev. L Garmin GI 275 Pilot's Guide
System Overview
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