Garmin G500H Pilot's Manual page 21

AHRS Inputs
GPS Magnetometer
Unavailable Unavailable
Unavailable Available
Unavailable Unavailable
AHRS Normal
Operation
Loss of GPS, magnetometer, or air data inputs is communicated to the pilot by
message advisory alerts. Refer to Section 6 for specific AHRS alert information.
Any failure of the internal AHRS inertial sensors results in loss of attitude and
heading information. This is indicated by red "X" flags over the corresponding
flight instruments.
A maximum of two GPS inputs are provided to the AHRS. If GPS information
from one of the inputs fails, the AHRS uses the remaining GPS input and an
alert message is issued to inform the pilot. If both GPS inputs fail, the AHRS
will 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 and GPS Track information is used. However, the PFD heading
display is flagged as invalid with a red "X" and "TRK" is annunciated to the
right of the Track value in magenta. The Track value color changes from white
to magenta.
NOTE: In this case the magnetic standby compass and GPS ground track
can be used to keep the aircraft on the desired heading.
Map orientations change from HDG UP to TRACK UP and Map orientations
will change back to HDG up when heading is restored.
190-01150-02 Rev. J
Air Data
Available No Mag
Unavailable
Unavailable
Table 1-1 AHRS Operation
Heading AHRS No-GPS
Invalid
Figure 1-5 AHRS Operation
Garmin G500H Pilot's Guide
AHRS AHRS Outputs
Mode
Attitude
Available
Fail Unavailable Unavailable
Fail Unavailable Unavailable
Mode
Heading
GPS Track
Attitude/Heading
Invalid
1-5