Garmin PDAs & Smartphones G1000 用户手册

190-00498-07  Rev. A

565

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.

Display system is not receiving airspeed input from air data computer.

Display is not receiving altitude input from the air data computer.

Display is not receiving vertical speed input from the air data computer.

Display is not receiving valid heading input from AHRS.

Different versions of GDU software are installed in the PFD and MFD.  This can 
also indicate different versions of navigation software are installed in the PFD and 
MFD.  In some circumstances, a cross-talk error between the PFD and MFD can 
cause this annunciation.

‘LOI’ Indicates Loss of Integrity of GPS information.  GPS information is either not 
present or is invalid for navigation use.  ‘DR’ may also be seen indicating that GPS 
is in Dead Reckoning Mode.  Note that AHRS utilizes GPS inputs during normal 
operation.  AHRS operation may be degraded if GPS signals are not present (see 
AFMS).

Display is not receiving valid transponder information.

Other Various Red X Indications

A red ‘X’ through any other display field, such as engine instrumentation fields, 
indicates that the field is not receiving valid data.