Garmin Cirrus Perspective SR20 Pilot's Manual page 43

In the event of a display failure, the system automatically switches to reversionary (backup) mode. In
Reversionary Mode, all essential flight information from the PFD is combined with the EIS and presented on
the display operating in Reversionary Mode. EIS operation while in Reversionary Mode is discussed in the EIS
Section. As when the PFD is operating normally, windows for flight planning, nearest airports, and procedures
are available. The Inset Map is moved to the right side of the display.
If a display fails, the appropriate IAU-display Ethernet interface 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.
If the system fails to detect a display problem, Reversionary Mode may be manually activated by pressing the
red DISPLAY BACKUP Button. Pressing this button again deactivates Reversionary Mode.
Manually Activates/Deactivates
Reversionary Mode on Both Displays
The system alerts the pilot when backup paths are utilized by the LRUs. Refer to the Appendices for
NOTE:
further information regarding system-specific alerts.
190-00820-08 Rev. A
DISPLAY BACKUP Button
Figure 1-20 Reversionary Mode (Failed PFD)
Cirrus Perspective by Garmin – Pilot's Guide for the SR20/SR22/SR22T
™
SYSTEM OVERVIEW
NAV1 and COM1 (provided by the
failed PFD) Flagged Invalid
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