CHAPTER 6, EMERGENCY AND ABNORMAL PROCEDURES
EFD1000 PFD Pilot’s Guide
Page 6-4 A-01-184-00 REV B
EFD1000 PFD Pilot’s Guide
EFD1000 PFD Pilot’s Guide
6.3. Loss of External Power
In the event that external power to the unit is degraded or fails, the EFD1000 will
automatically switch to its internal battery. When operating on internal battery, the
display backlight intensity is capped at a value of 70. An annunciation of this operating
state and the estimated battery charge remaining is displayed in the lower portion of
the attitude indicator (Figure 6-5).
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 12.8V (14V Electrical System)
or 25.6V (28V Electrical System) will cause the EFD to automatically
switch to its internal battery.
This will be accompanied by 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.
6.4. Power Override
To Override the Automatic Power Conguration
1. Push the MENU Key. The Menu displays on the Navigation Display.
2. Rotate the Right Knob until Page 6 of the Menu displays.
3. The current power souce is listed at Key 1 (Figure 6-6), push Key 1 to
alternately switch between external power (EXT PWR) and the internal battery
(BATTERY).
4. Push the MENU key to exit the Menu.
Figure 6-5 PFD0190 Internal Battery
Operational
Figure 6-6 Menu, POWER
SETTINGS, Page 6 of 7, Key 1
WARNING
The EFD1000 PFD internal
battery will provide
approximately 30 minutes of
operation for the AHRS and
display following loss of aircraft
power. If aircraft power cannot
be restored, the pilot should
follow the electrical failure
checklist in the Aircraft
Flight Manual.
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