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G3X Installation Manual – GSU 73 Page 4-1
190-01115-01 Revision A
4 GSU 73
4.1 Equipment Description
NOTE
There is no TSO/ETSO applicable to the GSU 73.
The GSU 73 is intended for the LSA (light sport aircraft) and experimental 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 44 for heading information and also computes OAT and TAS from inputs provided by the GTP 59.
The GSU 73 is capable of maneuvers through a range of 360° in bank and pitch. The rotation rate
capability is ±200° per second.
Bank error and pitch error are within ±1.25° over the range of 30° bank, left and right, and 15° pitch nose
up and nose down. Heading is accurate to within 2° in straight and level flight.
Due to unsuitability of the magnetic fields near the Earth’s poles, operational accuracy is unknown north
of 70° North latitude and south of 70° South latitude. In addition, operational accuracy is unknown in the
following two regions:
1) North of 65° North latitude between longitude 75° W and 120° W. (Northern Canada)
2) South of 55° South latitude between longitude 120° E and 165° E. (Region south of Australia and
New Zealand)
Figure 4-1. GSU 73 Unit View