Garmin G950 Pilot's Manual page 458

APPENDIX A
System Annunciation
446
Comment
Attitude and Heading
Reference System is aligning.
Display system is not receiving
attitude information from the
AHRS.
AHRS calibration incomplete or
configuration module failure.
This annunciation is only seen
when the autopilot is engaged.
The annunciation indicates an
AHRS monitor has detected
an abnormal flight parameter,
possibly caused by strong
turbulence. In this case, the
situation should correct itself
within a few seconds. If there
is an actual failure, a red "X"
soon appears over the Attitude
Indicator.
GPS information is either
not present or is invalid for
navigation use. Note that
AHRS utilizes GPS inputs
during normal operation.
AHRS operation may be
degraded if GPS signals are not
present (see POH).
Display system is not receiving
airspeed input from air data
computer.
Table A-1 G950 System Annunciations
Garmin G950 Pilot's Guide for the Pilatus PC-6
System Annunciation
Display system is not receiving
vertical speed input from the
air data computer.
Display system is not receiving
altitude input from the air data
computer.
Display system is not receiving
valid heading input from AHRS.
System is not receiving valid
heading input from GMU, but
is receiving GPS-derived track
information.
Display system is not receiving
valid true airspeed information
from air data computer.
Display system is not receiving
valid OAT information from air
data computer.
Display system is not receiving
valid transponder information.
Different versions of GDU
software are installed in the
PFD and MFD. This can also
indicate different versions
of the navigation database
installed in the PFD and MFD.
A cross-talk error between the
PFD and MFD will also cause
this annunciation.
A red 'X' through any other
display field (such as engine
Other Various Red X
instrumentation fields)
Indications
indicates that the field is not
receiving valid data.
Comment
190-00870-02 Rev. A