Figure 1-6 Gi 275 Standby Indicator - Garmin GI 275 Installation Manual

1.2.2.4 Standby Indicator
The GI 275 in a standby configuration displays the same information as the Primary ADI and has the same
requirements as the Primary ADI. A display backup switch is required if installed as an MFD/Standby ADI
or HSI/Standby ADI. Refer to Section 3.2.2 for information.
The Standby ADI will automatically revert to display secondary ADI data in the case of a Primary ADI
failure. The MFD/Standby ADI can display MFD pages and the HSI/Standby ADI can display HSI pages
under normal operating conditions (i.e., when the Primary ADI is functional) in certain aircraft. Refer to
Section 2 for limitations.
NOTE
When the Standby ADI is in reversionary mode, all previously configured MFD or HSI
pages are unavailable. Only the ADI page will be displayed.
The Standby ADI monitors the primary indicator during normal operation. When the standby indicator
senses a discrepancy, it automatically reverts to displaying its secondary ADI data within 1 second.
Additionally, a display backup switch may be required to be installed. When this switch is set to AUTO, the
standby display functions as outlined above. When the switch is set to ON, the standby display will always
display the aircraft's secondary ADI data whether or not there is a miscompare between the Primary ADI
and standby indicator. MFD/HSI pages are disabled when the switch is set to ON.
Required and installed per
STC
Optional and installed per
STC
Not installed per STC
Backup GPS
Coaxial
Antenna
[3]
RS‐232 (GMU 44B)
GMU 44B
RS‐485 (GMU 44B)
OR
RS‐232 (GMU 11)
GMU 11
Magnetometer LRU Power
Reversionary
Discrete
Switch
[6]
USB
GSB 15
[1]....Refer to Section 2 for limitations.
[2]....Required connection for aiding AHRS.
[3]....GPS interface is required. Either Backup
antenna or external GPS source.
[4]....Must be retained.
[5]....Reserved
[6]....Required when Standby is configured with
MFD pages.
[7]....The OAT sensor is not a required interface
for Standby ADI units.
[8].....A backup battery is required for Standby
GI 275 units that do not utilize an
electrical power source that is
independent from the aircraft's primary
electrical power source.
190-02246-10
Rev. 11
GTP 59
Analog
OAT Probe
[7]
Internal ADAHRS
OR
MFD/Standby ADI
[Attitude, Altitude, Airspeed, and Heading]
Backup Battery
Radar
ARINC 429
Altimeter
GPS #1‐2
HSDB or
RS‐232
[3]

Figure 1-6 GI 275 Standby Indicator

Mechanical
[ADAHRS]
GI 275
[1]
(Required) [8]
HSDB or ARINC 429
HSDB or Analog or
RS‐232 or ARINC 429
GI 275 Part 23 AML STC Installation Manual
Pitot/Static
Plumbing
[2]
PFD
HSDB
[1]
Standby
Instrument
Magnetic
Compass
[4]
RS‐232
Stormscope
Traffic/
SVT Traffic
NAV # 1‐2
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