EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 167-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
12.1.2 Power Control
To enhance safety, the EFD1000 includes an internal battery that allows the system to
continue to operate in the event of a failure of the aircraft electrical system. This
ensures that in addition to the standby instruments, the EFD1000 primary flight
instrument continues to remain available for a period of time following the loss of all
external supply power.
This internal battery is not required by regulation; however, it is good practice to verify
that the charge state of the battery prior to takeoff.
The typical EFD1000 installation receives aircraft power from the battery bus via a
dedicated circuit breaker and optional EFIS Master Switch.
Whenever indicated airspeed is invalid or below 30 KIAS the EFD1000 will power up
and power down with the application or removal of external power. A message is
presented during the normal power down sequence to enable the pilot to abort the
shutdown and switch to internal battery.
When IAS is greater than 30 KIAS and the input voltage drops below 12.8V (14V
Electrical System) or 25.6V (28V Electrical System) the EFD will automatically switch to
its internal battery (e.g. aircraft charging system failure).
The EFD1000 internal battery will provide at least 30 minutes of power when it is fully
charged. The battery provides power to the display head, RSM and emergency GPS.
Reducing the backlight intensity will extend the battery operating time.
When operating from battery, a red “ON BAT” annunciation and battery charge status
indication is presented in the lower portion of the Attitude Indicator.
A unit operating from battery may be powered off using the “Shut Down” command
available in the Power Settings Menu.
In the unlikely event that the normal power control is not working, the EFD may be
forced to shut down by first pulling its associated circuit breaker and then pressing
and holding the REV button for at least 5 seconds.
Battery charge status may be viewed from the “Power Settings” page of the Main Menu.
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