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190-00820-11 Rev. A
Pilot’s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin
32
SYSTEM OVERVIEW
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
AHRS OPERATION
NOTE:
Aggressive maneuvering in reversionary mode can degrade AHRS accuracy.
The Attitude and Heading Reference System (AHRS) performs attitude, heading, and vertical acceleration
calculations for the system, using 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.
AHRS no-GPS
Mode
AHRS coast-on-gyros
until invalid
AHRS Normal
Mode
AHRS no-Mag
Mode
AHRS no-Mag/
no-Air Mode
Heading Invalid
Heading Invalid
Attitude/Heading Invalid
YES
YES
YES
NO
NO
NO
Air Data Available and Reliable?
Mag Data Available and Reliable?
YES
NO
Mag Data AND Air Data
Available and Reliable?
GPS Data Available and Reliable?
Figure 1-20 AHRS Operation
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’ indications over the corresponding flight
instruments).
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.
If the magnetometer input fails, the AHRS continues to output valid attitude information. If GPS-based track
information is available while magnetometer input has failed, the HSI displays the ground track instead of
heading using HSI Track Mode. In this mode, a magenta ‘TRK’ annunciation and track readout appear on the
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