Autopilot Interface; Vfr Gps; Transponder Control; Usb Connection - Garmin GI 275 Installation Manual

A GPS source is required to be interfaced to GI 275 ADAHRS and ADAHRS+AP units. Approved internal
and external GPS sources are listed in Appendix Section C.4.
2.1.8

Autopilot Interface

The GI 275 analog attitude output and flight director input must be connected to a pilot-side GI 275 that is
configured to display the ADI full-time. The autopilot heading error, course error, and lateral/vertical
deviation signals must be connected to a pilot-side GI 275 that is configured as either an ADI capable of
displaying course deviations or an HSI.
If the GI 275 is interfaced with the GFC 500, a TSO approved GPS source is required for the GFC to
utilize NAV modes; the GI 275 VFR GPS does not provide NAV modes with the GFC 500.
2.1.9

VFR GPS

The VFR GPS can be used with an installed glareshield antenna as a backup GPS source in Class I - IV
aircraft or in an aircraft without a primary GPS source. If the aircraft is IFR rated, the aircraft must
maintain its equipment for IFR requirements (i.e., NAV sources). The display of primary VFR GPS is for
situational awareness only and is not approved for IFR navigation credit.

2.1.10 Transponder Control

The Transponder Control function is only provided when the GI 275 is interfaced to a GTX 345 series
transponder. If configured, the Transponder Control page must be set as the final page on an MFD or
MFD/Standby ADI unit.
The GI 275 must be the only control source for the GTX 345 if used for the transponder control function;
control using another source, such as a GTN, is outside the scope of this STC.

2.1.11 USB Connection

Each installed GI 275 unit must have a dedicated USB connection. This can be accomplished with either
the USB pigtail (P/N 325-00238-02) that is included in each GI 275 connector kit or with the optional
GSB 15.
The USB pigtail is for maintenance purposes only and is prohibited from being used while in-flight. The
USB pigtail must be capped and stowed prior to returning the aircraft to service. The GSB 15 is capable of
powering PEDs using its USB ports while in-flight.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
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