CHAPTER 4 GETTING STARTED
EFD1000/500 MFD Pilot’s Guide
Page 4-16 091-00006-001 REV B
EFD1000/500 MFD Pilot’s Guide
Page 4-17091-00006-001 REV B
4.4. Backup Battery
The EFD units all have an internal backup battery in case of degraded external power.
The internal battery provides sucient power for 30 minutes of display operation
at temperatures that would be comfortable to the aircraft occupants. The battery is
charged by the EFD1000/500 MFD 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 4-29).
Some installations include an alternate, higher-capacity, Emergency Backup Battery
(EBB) connected to the EFD1000 MFD. The EBB assures 30 minutes of operation under
all foreseeable operating conditions (i.e. extremely cold or hot conditions), and far
exceeds the 30 minute capacity at normal temperatures. The purpose of the EBB is
to provide assured power to the backup instruments when the EFD1000 MFD is the
only airspeed and altimeter backup. Refer to the Aircraft Flight Manual Supplement to
determine if your installation includes the EBB, and for usage instructions.
Figure 4-29
Internal Battery Annunciation
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