Ahrs operation, System overview, Gps input failure – Garmin G1000 Mooney M20TN User Manual
Page 21: Magnetometer failure, Air data input failure, Airspeed data magnetometer, Figure 1-9 ahrs operation
190-00647-00 Rev. A
Garmin G1000 Pilot’s Guide for the Mooney M20M/M20R/M20TN
1-11
SYSTEM OVERVIEW
AHRS OPERATION
NOTE:
Aggressive maneuvering while AHRS is not operating normally may degrade AHRS accuracy.
The Attitude and Heading Reference System (AHRS) performs attitude, heading, and vertical acceleration
calculations for the G1000 System, utilizing GPS, magnetometer, and air data in addition to information
from its internal sensors. Attitude and heading information are updated on the PFD while the AHRS receives
appropriate combinations of information from the external sensor inputs.
Loss of GPS, magnetometer, or air data inputs is communicated to the pilot by message advisory alerts (refer
to Appendix A for specific AHRS alert information). 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).
GPS INPUT FAILURE
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
can continue to provide attitude and heading information to the PFD as long as magnetometer and airspeed
data are available and valid.
MAGNETOMETER FAILURE
If the magnetometer input fails, the AHRS continues to output valid attitude information; however, the
heading output on the PFD is flagged as invalid with a red ‘X’.
AIR DATA INPUT FAILURE
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.
Attitude/Heading Invalid
AHRS
no-GPS
Mode
AHRS Normal
Operation
AHRS no-
Mag Mode
AHRS no-Mag/
no-Air Mode
Heading Invalid
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Figure 1-9 AHRS Operation