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1-8
Garmin G600 Pilot’s Guide
190-00601-02 Rev. E
Foreword
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazard
Avoidance
Sec 5
Additional
Features
Sec 6
Annun.
& Alerts
Sec 7
Symbols
Sec 8
GlossaryAppendix A
Appendix B
Index
AHRS Normal
Operation
Heading
Invalid
AHRS No-GPS
Mode
Altitude/Heading
Invalid
Figure 1-12 AHRS Operation
Loss of GPS, magnetometer, or air data inputs is communicated to the pilot by
message advisory alerts (refer to Section 6 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).
A maximum of 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
will 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 and GPS Track information is used; however, the heading display
on the PFD is flagged as invalid with a red “X,” “TRK” in magenta is annunciated
to the right of the Track value, and the Track value color is changed from white
to magenta.
NOTE: In this case the magnetic standby compass and GPS ground track
can be used to keep the aircraft on the desired heading.
Note that SVT is turned off in “track-based reversionary mode” and must be
manually re-enabled when heading is restored. Also, map orientations change
from HDG UP to TRACK UP and must be manually changed back after heading
is restored.
When heading fails the heading bug is not removed and the GDU continues
driving the autopilot heading error output using track in place of heading.