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190-01255-00 Rev. B
Garmin G1000H
™
Pilot’s Guide for the Bell 407GX
13
SYSTEM OVERVIEW
REVERSIONARY DISPLAY OPERATION
NOTE: The G1000H System alerts the pilot when backup paths are utilized by the LRUs. Refer to Appendix
A for further information regarding system-specific alerts.
In the event of a display failure, the G1000H System automatically switches to reversionary (backup) mode.
In reversionary mode, all important flight information is presented on the remaining display in the same format
as in normal operating mode.
If a display fails, the appropriate IAU Ethernet interface to the display is cut off. Thus, the IAU 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 IAU are flagged as invalid on the remaining display. The system reverts to backup
paths for the AHRS, ADC, Engine/Airframe Unit, and Transponder, as required. The change to backup paths is
completely automated for all LRUs and no pilot action is required.
Figure 1-9 Reversionary Mode
If the system fails to detect a display problem, Reversionary Mode may be manually activated by pressing the
red DU
BACKUP
Button on the instrument panel. Pressing this button again deactivates Reversionary Mode.