Figure 1-2 Gi 275 Primary Adi - Garmin GI 275 Installation Manual

1.2.2 Functions
1.2.2.1 Primary Attitude and Direction Indicator (ADI)
Figure 1-2 shows the GI 275 configured as a Primary ADI. The GI 275 ADAHRS or ADAHRS+AP
provides 4-in-1 display of attitude, altitude, airspeed, and heading.
If desired, the Primary ADI can be configured as a basic attitude indicator 3-in-1 display of attitude,
altitude, and airspeed only. In this case, the primary heading indicator must be retained or replaced with a
GI 275 HSI.
The GI 275 ADAHRS and ADAHRS+AP variants contain an integrated ADAHRS (Air Data and Attitude
Heading Reference System), which provides the primary display of attitude, altitude, airspeed, and
optional heading data. The attitude data is displayed in the form of a virtual blue sky and brown ground
with a white horizon line. Airspeed and altitude data are displayed as tapes vertically along the outer
portion of the display. The heading data is displayed horizontally along the bottom of the display.
Required and
installed per STC
Optional and
installed per STC
Not installed per
STC
Backup GPS
Antenna
[2]
GMU 44B
OR
GMU 11
Magnetometer
[3]
GSB 15
[1]....GI 275 ADAHRS+AP required to drive the
autopilot if equipped.
[2]....GPS source is required. Either backup
antenna or external GPS source
[3]....Required if used as compensated heading
source for HSI functionality.
[4]....Reserved.
[5]....The OAT sensor is not a required interface
for Primary ADI units unless the aircraft is
IFR and the turn coordinator is removed or
there is not a third source of attitude.
[6]....Required connection for aiding AHRS.
190-02246-10
Rev. 11
GTP 59
OAT Probe
[5]
Coaxial
RS‐232 (GMU 44B)
RS‐485 (GMU 44B)
OR
RS‐232 (GMU 11)
LRU Power
[Attitude, Altitude, Airspeed, and Heading]
USB
GPS #1‐2
[2]
HSDB or Analog or
NAV #1‐2
Radar
Altimeter

Figure 1-2 GI 275 Primary ADI

Analog Mechanical
Internal ADAHRS
[ADAHRS or ADAHRS+AP units]
GI 275
ADI
Backup Battery
(Optional)
HSDB or HSDB or
RS‐232 & ARINC 429
ARINC 429
Analog
RS‐232 or
ARINC 429
HSDB or
ARINC 429
Discrete & ARINC 429
GI 275 Part 23 AML STC Installation Manual
Pitot/Static
Plumbing
[6]
SVT
Traffic
External Flight
Director
Autopilot
[1]
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