Garmin G3X Touch Pilot's Manual page 46

System Overview
Magnetometer Data
AHRS no-
AHRS Normal
Mag Mode
Operation
Loss of GPS, magnetometer, or air data inputs is communicated to the pilot by
message advisory alerts. Any failure of the internal AHRS inertial sensors results in loss
of attitude and heading information (indicated by red 'X' flags over the corresponding
flight instruments). If the G3X Touch senses that the magnetic heading measurement
is valid, but possibly outside of the internal accuracy limits, the numeric heading value
on the PFD is displayed in yellow.
If GPS input fails, the AHRS can continue to provide attitude and heading information
to the PFD as long as magnetometer and airspeed data are available and valid.
If the magnetometer input fails, the AHRS continues to output valid attitude
information; however, the heading output on the PFD Page is flagged as invalid with
a red 'X'.
Failure of the air data input has no effect on the AHRS output while AHRS is receiving
valid GPS information. Invalid/unavailable airspeed data in addition to GPS failure
results in loss of all attitude and heading information. Likewise, loss of magnetometer
(heading) data, in combination with loss of GPS data, results in a loss of all attitude
and heading information.
26
GPS Data
Air Data
AHRS no-Mag/
no-Air Mode
Heading Invalid
Garmin G3X Touch Pilot's Guide
Magnetometer Data
Air Data
AHRS
no-GPS
Attitude/Heading Invalid
Mode
190-01754-00 Rev. L