Version 15.0 AF-5000 Series Pilot Guide 37
TCW Backup Battery
When the main power to the EFIS is lost the EFIS should continue to run on the battery backup power. A new
fully charged battery should power the EFIS for about an hour. You should dim the EFIS screen (CHECK >
DIM > Top Knob) to make the battery last longer. When power is lost you should get an audible “CHECK
VOLTAGE” warning and the Backup Battery Voltage will be displayed on the EFIS Status Bar.
Main EFIS Power Voltage
Backup Battery Voltage
Every time you shut off power to the EFIS it should switch to the backup battery for 30 seconds and bring up a
warning that it is about to shut down. If you press any button during the shutdown warning it will continue to
run for 5 minutes before doing another 30 second shutdown warning.
• If the EFIS is displaying Airspeed or Engine RPM it will not try and shutdown.
• If the EFIS immediately turns off when you turn off power you should check the TCW
backup battery wiring and TCW case fuse
TCW Backup Battery Fuse
The TCW battery has a 10 AMP ATM MINI fuse that can be replaced on the side of the unit.
The EFIS backup DSUB 15 connector cable has male pins and if you are not carefull
when you plug it into the EFIS you can blow the TCW fuse.
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