Cockpit Reference Guide

Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-12 Rev. A
13-10
SECTION 13 – ANNUNCIATIONS
& ALERTS
System Annunciation Comment
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.
Display 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 navigation databases 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).
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.