Garmin G1000 Piper PA-46 Matrix - Manual (Page 34)

190-01108-00 Rev. B Garmin G1000 Pilot’s Guide for the Piper PA-46 Mirage/Matrix 20
SYSTEM OVERVIEW
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EICAS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
AHRS OPERATION
NOTE: Refer to the Appendices for specific AHRS alert information.
NOTE: Aggressive maneuvering while AHRS is not operating normally may degrade AHRS accuracy.
In addition to using internal sensors, the GRS 77 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 (see Figure 1-13)
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.
Attitude/Heading Invalid
AHRS
no-GPS
Mode
AHRS Normal
Operation
AHRS no-
Mag Mode
AHRS no-Mag/
no-Air Mode
Heading Invalid
av
ailab
le
av
ailab
le
una
va
ilab
le
una
vailab
le
av
ailab
le
una
va
ilab
le
una
va
ilab
le
av
ailab
le
Air Data
Magnetometer Data
una
va
ilab
le
av
ailab
le
GPS Data
Magnetometer Data
Air Data
Figure 1-13 AHRS Operation