190-02177-02 Rev. A
Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
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
13
SYSTEM OVERVIEW
NOTE:
Refer to the Appendices for specific system message information.
ADAHRS Mode
GPS Data
Available
Magnetometer
Data Available
Air Data
Available
Condition
Attitude
Indicator
ADAHRS Normal
Yes
Yes
Yes
Valid Pitch/Roll/
Heading.
ADAHRS no-Air
Data
Yes
Yes
No
ADAHRS no-GPS
No
Yes
Yes
ADAHRS no-GPS/
no-Mag
No
No
Yes
Valid Pitch/Roll.
Heading will
coast-on-gyros
until it becomes
invalid.
ADAHRS no-Mag
Data
Yes
No
Yes
Valid Pitch/Roll.
Invalid Heading.
ADAHRS no-Mag/
no-Air Data
Yes
No
No
ADAHRS coast-
on-gyros until
invalid
No
Yes
No
Invalid Pitch/Roll/
Heading.
ADAHRS no-Mag/
coast-on-gyros
until invalid
No
No
No
Table 1-2 ADAHRS Operation
AHRS OPERATION
NOTE:
Refer to the Appendices for specific system message information.
In addition to using internal sensors, the AHRS uses GPS information, magnetic field data and air data
to assist in attitude/heading calculations. In normal mode, the AHRS relies upon GPS and magnetic field
measurements. If either of these external measurements is unavailable or invalid, the AHRS uses air data
information for attitude determination. Four AHRS modes of operation are available and depend upon the
combination of available sensor inputs. Loss of air data, GPS, or magnetometer sensor inputs is communicated
to the pilot by message advisory alerts.
