190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page F-1
APPENDIX F GSU 73 SENSOR UNIT INSTALLATION
NOTE
The GSU 73 has been discontinued and is no longer available for purchase.
The GSU 73 can be installed as part of the G3X™ avionics system. This section contains general
information as well as installation information for the GSU 73. Use this section to mount the GSU 73 unit.
F.1 Equipment Description
NOTE
There is no TSO/ETSO applicable to the GSU 73.
The GSU 73 is intended for the experimental aircraft and LSA (light sport aircraft) markets. The Garmin
GSU 73 Sensor Unit is not a TSO-certified product and has received no FAA approval or endorsement.
The GSU 73 is intended to be used as a part of the G3X system and it is not suitable for installation in type-
certificated aircraft.
The GSU 73 is an LRU that provides AHRS and Air Data information as well as an interface to Engine/
Airframe sensors in a single mechanical package. The GSU 73 interfaces to a remote mounted GMU 22 for
heading information and also computes OAT and TAS from inputs provided by the GTP 59.
NOTE
The GSU 73 is not compatible with the GMU 11 magnetometer. Installations with a
GSU 73 must also include a GMU 22 connected to the GSU 73.
NOTE
In installations using more than one ADAHRS, the GSU 73 will always be designated as
ADAHRS 1 and the GSU 25 units will be designated as ADAHRS 2, ADAHRS 3, etc.
Figure F-1 GSU 73 Unit View
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