Equipment Description - Garmin GSU 75 Series Installation Manual

1.2 Equipment Description

1.2.1 GSU 75
The Garmin GSU 75 ADAHRS (Air Data, Attitude and Heading Reference System) is a remote mounted
device that provides flight altitude, airspeed, attitude and heading data for flight instrumentation.
The GSU 75 provides the following information in ARINC 429 format:
• Aircraft Altitude and Airspeed
• Aircraft Vertical Speed, Mach, and Air Temperature
• Aircraft Heading, Pitch, and Roll
• Aircraft Yaw, Pitch, and Roll rates
• Aircraft Body-axis Accelerations
• Rates of Change of Heading, Pitch, and Roll
• Aircraft Accelerations Expressed in a Local Level Frame of Reference
• Density Altitude
• Pressure Altitude
• Indicated Airspeed
• True Airspeed
Operating voltage is 14/28 volts DC. The GSU 75 also provides the operating current to the GTP 59 OAT
Probe and operating voltage to the GMU 44 Magnetometer.
The GSU 75/GMU 44 is capable of maneuvers through a range of 360° in bank and pitch. The rotation
rate capability is ± 250 °/s. However, ARINC 429 angular rate output messages are limited to ±128° per
second.
Bank error and pitch error are within 1.0° in static conditions and +/- 2.5° under dynamic and flight
conditions. Heading accuracy is within +/- 2.0° in static conditions and +/- 6.0° in dynamic and flight
conditions.
Operation in the following regions is not authorized due to unsuitability of the magnetic fields near the
Earth's poles:
1. North of 72° North latitude at all longitudes
2. South of 70° South latitude at all longitudes
3. North of 65° North latitude between longitude 75° W and 120° W. (Northern Canada)
4. North of 70° North latitude between longitude 70° W and 128° W. (Northern Canada)
5. North of 70° North latitude between longitude 85° E and 114° E. (Northern Russia)
6. South of 55° South latitude between longitude 120° E and 165° E. (Region south of Australia and
New Zealand)
1.2.2 GMU 44
The Garmin GMU 44 Magnetometer is a remote mounted device that provides magnetic information to
support the function of the GSU 75. The GSU 75 provides operating voltage to the GMU 44
Magnetometer.
190-01639-00
Rev. 6
The document reference is online, please check the correspondence between the online documentation and the printed version.
GSU 75 ADAHRS Installation Manual
340095
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