
Garmin G1000 Cockpit Reference Guide for the Piper PA-34-220T Seneca
190-01405-00 Rev. A 77
Abnormal Operation
Flight
Instruments EIS
Nav/Com/
XPDR/Audio GPS Nav
Flight
Planning Procedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation Annun/Alerts Appendix Index
ABNORMAL OPERATION
REVERSIONARY MODE
Should a system detected failure occur in either display, the G1000 automatically
enters reversionary mode. In reversionary mode, critical flight instrumentation is
combined with engine instrumentation on the remaining display.
In the event of display failure, the display modes are as follows:
• PFD failure – Press the DISPLAY BACKUP Button on the audio panel to
put the MFD in reversionary mode.
• MFD failure – PFD1 and PFD 2 enter reversionary mode.
• PFD2 failure – PFD 1 and the MFD function normally.
In installations containing one audio panel, reversionary display mode can be
manually activated by pressing the DISPLAY BACKUP Button on the audio panel.
In installations containing two audio panels, manual activation of reversionary
display mode is accomplished by pressing the DISPLAY BACKUP Button on the
appropriate audio panel.
• PFD1 – By pressing the DISPLAY BACKUP Button on the left audio panel.
• MFD – By pressing the DISPLAY BACKUP Button on the left or the right
audio panel.
• PFD2 – By pressing the DISPLAY BACKUP Button on the right audio
panel.
NOTE: The PA-34-220T Seneca Pilot’s Operating Handbook (POH) always
takes precedence over the information found in this section.
ABNORMAL COM OPERATION
When a COM tuning failure is detected by the system, the emergency frequency
(121.500 MHz) is automatically loaded into the active frequency field of the COM
radio for which the tuning failure was detected. In the event of a failure of both PFDs,
the emergency frequency (121.500 MHz) automatically becomes the active frequency
on both COM radios.
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