CHAPTER 6 EXPANDED EMERGENCY AND ABNORMAL PROCEDURES
EFD1000/500 MFD Pilot’s Guide
Page 6-8 091-00006-001 REV B
EFD1000/500 MFD Pilot’s Guide
Page 6-9091-00006-001 REV B
6.7. EBB Disconnect (EFD1000 MFD only)
To isolate the EBB in the event of an EBB or EFD1000 MFD malfunction, proceed as
follows:
Isolate the Emergency Backup Battery
1. EBB Switch ..................................................................Select DISC
The EBB is protected by thermal and short-circuit sensing circuitry to prevent battery
overheating or damage. The battery is normally connected to its EFD1000 MFD. If it
is desired to remove battery power from the EFD1000 MFD, or to otherwise isolate
the EBB, the EBB includes an externally activated isolation relay integral to the EBB
aluminum housing. This relay is activated by the EBB Disconnect Switch installed in the
instrument panel.
The EBB Emergency Disconnect switch is either a guarded or lever-lock switch mounted
on or adjacent to the instrument panel and within the pilot’s reach. The switch should
be left in the NORM position at all times, including when away from the aircraft. When it
is desired to disconnect the EBB from the EFD1000 MFD display, move the switch to the
DISC position.
NOTE
When in the “DISC” position, the EBB isolation relay is
powered from the EBB. Thus, when the switch is in the
disconnect position, the Emergency Backup Battery will
gradually discharge.
NOTE
Setting the disconnect to EMER. DISC. closes the relay
to the EFD and therefore will drain the EBB battery. As
such do not set the EBB to EMER. DISC. when garaging
the aircraft.
If the EBB is inadvertently drained, apply auxillary
power to the aircraft, turn on the EFD1000 MFD and
allow the EBB to recharge. The EBB takes approximately
three (3) hours to recharge when the temperature is at
25°C.
The EBB will not recharge at temperatures below 0°C or
above 25°C.
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