190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 17-1
17 GSU 25/25B/25C/25D (AHRS/AIR DATA SENSOR UNIT)
INSTALLATION
NOTE
References to the GSU 25 throughout this manual apply equally to the GSU 25B,
GSU 25C, and GSU 25D except where specifically noted.
The GSU 25 can be installed as part of the G3X™ avionics system. This section contains general
information as well as installation information for the GSU 25. Use this section to mount the GSU 25 unit.
NOTE
The GSU 25 was a prior version of the GSU 25C, all form, fit, and functions are identical
for the two models.
NOTE
The GSU 25B was a prior version of the GSU 25D, all form, fit, and functions are
identical for the two models.
17.1 Equipment Description
NOTE
There is no TSO/ETSO applicable to the GSU 25.
The GSU 25 is not supported for installations in type certificated aircraft using the guidance in this
installation manual.
The GSU 25 is an LRU that provides AHRS and Air Data information in a single mechanical package. The
GSU 25 interfaces to a remote mounted GMU magnetometer for heading information and also computes
OAT and TAS from inputs provided by the GTP 59. Up to three GSU 25 units may be installed to provide
redundancy and cross-checking of attitude, heading, and air data.
The GSU 25 provides the functions in Table 17-1.
Table 17-1 GSU 25 Functions
Air Data Interfaces AHRS
Pressure Altitude CAN (1)
Magnetic Heading (with input
from GMU
magnetometer)
Density Altitude RS-232 (2 TX/2 RX) Pitch Angle
Vertical speed OAT Probe (GTP 59) Roll Angle
Mach Number
Magnetometer (GMU 22)
(1 RS-232 TX/ 1 RS-485 RX)
Linear Accelerations
Indicated Airspeed Pitch, Roll, Yaw Rotation Rates
True Airspeed 3 axis angular rates
Angle of attack 3 axis accelerations
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