AUX VOLTS warning message

[Shawn McGinnis]

BACKVOLTS is the voltage of the power rail attached to Pin 15 of the EFIS Main cable. You probably lost your backup bus charge diode.

[johninreno]

BACKVOLTS is the voltage of the power rail attached to Pin 15 of the EFIS Main cable. You probably lost your backup bus charge diode.

Confused again! I don't think I have an external backup power attached to pin 15. My system is EFIS and EMS with internal backup batteries. I looked at the .ALD file again and it has some data from the earlier flight. BACKVOLTS starts at 8.5 at 10:30:05 and gradually climbs to 9.2 at 10:44:15. The next entry is 11.5 at 14:04:57. It quickly climbs to 12.9 and settles at 12.5 for the first 20 mninutes of that flight. Then the behavior described in the original post takes over.

john

[Rob Hickman]

The AF-3500 has two separate voltage inputs plus the backup battery. If you are not using the AUX power input you should turn the warning off from the calibration menu.