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190-00498-00 Rev. A
Garmin G1000 Pilot’s Guide for Cessna Nav III
1-13
SYSTEM OVERVIEW
REVERSIONARY MODE
Should a failure occur in either display, the G1000
automatically enters reversionary mode. In reversionary
mode, all important flight information is shown on the
remaining display. An example of reversionary mode
entry due to a failed PFD is shown in Figure 1-7.
If a display fails, the GIA 63-GDU 1040 Ethernet
interface is cut off. Thus, the GIA can no longer
communicate with the remaining display (refer to Figure
1-1), and the NAV and COM functions provided to the
failed display by the GIA are flagged as invalid on the
remaining display, as a result. The system reverts to
using backup paths for the GRS 77, GDC 74A, GEA 71
and GTX 33, as required. The change to backup paths is
completely automated for all LRUs, and no pilot action is
required.
Figure 1-7 Reversionary Mode (Failed PFD)
NOTE: The system alerts the pilot when backup
paths are utilized by the LRUs. Refer to the
Annunciations and Alerts Pilot’s Guide for
further information regarding these and other
system alerts.
Reversionary mode may also be manually activated by
the pilot if the system fails to detect a display problem.
Reversionary mode is activated manually by pressing the
red DISPLAY BACKUP button at the bottom of the Audio
Panel. Pressing this button again deactivates reversionary
mode.
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