CHAPTER 3 FLYING THE EFD1000 PRO PFD
EFD1000 PRO MAX PFD Pilot’s Guide
Page 3-8
091-00005-002 () EFD1000 PRO MAX PFD Pilot’s Guide
Page 3-9
091-00005-002 ()
3.4 Backup Battery
The EFD units all have an internal backup battery in case of degraded external power.
The internal battery provides sufficient power for 30 minutes of display operation at
temperatures that would be comfortable to the aircraft occupants. The battery
is charged by the EFD1000 PRO MAX PFD whenever the EFD unit is running on
aircraft power.
In the event that external power to the unit is degraded or fails, the MFD will
automatically switch to its internal battery. When operating on internal battery, the
display backlight intensity is limited to 40% in automatic mode and 70% in manual
mode. An “ON BAT” annunciation and the estimated battery charge remaining is
displayed on the display (Figure 3-7).
WARNING
Whenever there is a new altimeter setting, set both
the PFD and the standby altimeter.
Figure 3-7
Internal Battery Annunciation
CAUTION
During situations where a high electrical demand is placed on the
aircraft electrical system, electrical transients that cause aircraft
voltage to momentarily drop below 12.5±0.3V (14V Electrical
System) or 25.0±0.6V (28V Electrical System) will cause the MFD
to automatically switch to the backup battery and display an
ON BAT annunciation. The ON BAT annunciation should extinguish
shortly after the electric transient demand goes away. If the ON BAT
annunciation does not extinguish then an external power
source failure has most likely occurred.
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