Pilot's Guide

Garmin G1000 Pilot’s Guide for the Cessna Corvalis/Corvalis TT
190-00552-05 Rev. A16
SYSTEM OVERVIEW
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
AHRS OPERATION
NOTE: Refer to Appendix A for specific AHRS alert information.
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, 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.
The system uses message advisory alerts to communicates loss of GPS, magnetometer, or air data inputs (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).
Attitude/Heading Invalid
AHRS
no-GPS
Mode
AHRS Normal
Operation
AHRS no-
Mag Mode
AHRS no-Mag/
no-Air Mode
Heading Invalid
available available
unavailable
unavailable
available
unavailable unavailable
available
Air Data
Magnetometer Data
unavailable
available
GPS Data
Magnetometer Data
Air Data
Figure 1-11 AHRS Operation
NOTE: In-flight initialization of AHRS, when operating without any valid source of GPS data and at true
air speed values greater than approximately 200 knots, is not guaranteed. Under these rare conditions, it
is possible for in-flight AHRS initialization to take an indefinite amount of time which would result in an
extended period of time where valid AHRS outputs are unavailable.
Two GPS inputs are provided to the AHRS. If GPS information from one of the inputs fails, the AHRS uses
the operating GPS input and an alert message is issued to inform the pilot. If both GPS inputs fail, the AHRS