190-02246-10 GI 275 Part 23 AML STC Installation Manual
Rev. 11 Page 1-9
Air Data
Air data information is provided by the GI 275 unit when it is connected to the aircraft pitot/static system.
The functions provided by the air data are shown below:
• Airspeed indicator
• Barometric altimeter
• Selected altitude setting, bug, and visual altitude alerting
• Secondary vertical speed with references
• AHRS aiding
Heading
The GI 275 can provide stabilized heading based on ADAHRS and magnetometer data, which is displayed
as a linear scale along the bottom of the ADI display with a digital readout of the current heading in
degrees. Labels on the linear scale denote increments of 30°, with white markings indicating smaller
increments for increased awareness.
GPS
The GI 275 requires GPS for attitude aiding. The indicator contains an internal GPS receiver that can be
connected to a GPS antenna mounted on the glareshield, or it can receive an input from an external GPS, if
available. As installed in this STC, the GI 275 receives the GPS data for aiding via the following methods:
• Glareshield GPS antenna
• GTN 6XX/7XX or GTN Xi series navigator
• GNS 4XXW/5XXW series navigator
• GNS 480 series navigator
• GTX 3X5 transponder with internal GPS receiver (software v3.00 or later)
• GPS 175/GNX 375/GNC 355
Deviations
The GI 275 Primary ADI can display vertical and lateral deviations from a compatible GPS and/or NAV. If
an external GPS or NAV is not available, the internal VFR GPS (with installed glareshield antenna) can
display lateral deviations for VFR Direct-To navigation only.
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