Garmin GI 275 User Manual

190-02246-10 GI 275 Part 23 AML STC Installation Manual
Rev. 11 Page 1-10
1.2.2.2 Horizontal Situation Indicator (HSI)
The GI 275 is designed to replace an existing DG/HSI as a drop-in replacement. The GI 275 HSI provides
magnetically stabilized heading based on GMU 11/44B data. The GI 275 HSI can also provide display of
course and deviation information from compatible VHF NAV and GPS sources. Air data information is
provided by the GI 275 unit when it is connected to the aircraft pitot/static system. The HSI can also be
used for heading and course deviations for an autopilot.
The GI 275 HSI provides the option of an enhanced EHSI page with a map underlay, which can display
ownship data on a moving map, as well as a CDI/VDI, which shows lateral and vertical course deviations.
Both the HSI and EHSI pages can be configured on an MFD or MFD/Standby ADI unit for added
versatility. In certain aircraft, the HSI can be installed as a standby indicator. The HSI/Standby ADI must
be a GI 275 ADAHRS or ADAHRS+AP unit and will auto-revert to the ADI page in the event a
miscompare or no compare occurs between the Primary ADI and the standby. If configured as an HSI/
Standby ADI, a backup battery may be required. Refer to Section 1.2.2.4 and Section 2.1.4 for more
information on requirements for standby indicators.
Figure 1-3 GI 275 Horizontal Situation Indicator
GI275
HSI

[3]
InternalADAHRS
[ADAHRSorADAHRS+APunits]
BackupBattery
(Optional)
NAV#1‐2
[5]
Traffic
Autopilot
[1]
GPS#1‐2
[4]
BackupGPS
Antenna
[4]
OR
Coaxial
RS‐232(GMU44B)
RS‐485(GMU44B)
RS‐232(GMU11)
LRUPower
[1].…GI275ADAHRS+APrequiredtodrive
autopilot,ifequipped.Referto
Section3forAPlimitations.
[2]….Forapplicableunitsonly.
[3]….GI275Baseunitcanbeusedbutrequires
interfacetoanotherGI275withan
integratedADAHRS.
[4]….GPSinterfaceisrequired.EitherBackup
antennaorexternalGPSsource.
[5]….EachGI275onlysupportsoneanalogNav
interface.
[6]….RequiredconnectionforAHRSAidingif
usedasaheading sourcewithan
interfacingGMU.
HSDB
or
ARINC429
Discrete&
ARINC429
or
Analog
GMU44B
OR
GMU11
Magnetometer
Weather
Requiredand
installedperSTC
Optionaland
installedperSTC
Notinstalledper
STC
GTP59
OATProbe
Analog
HSDBorAnalogor
RS‐232orARINC429
HSDB
or
RS‐232&ARINC429
HSDB
or
RS‐232
GSB15
USB
Mechanical
Pitot/Static
Plumbing
[6]

Garmin GI 275 Specifications

General

Brand	Garmin
Model	GI 275
Category	Avionics Display
Language	English