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terrence o'neill wrote:
I have dual GRT, a/p etc., and a Garmin 396 with its flight panel, which I think will not go dark if everything else does, as it automatically switches to its own battery. Am I overlooking something here?
Yes, you are overlooking something. If the GRT, a/p etc died because of an over-voltage condition, will the 396 that was connected to the same power supply and saw the same voltages survive? I do not know how Garmin has designed the power input on the 396 so I can not give a definitive answer. My educated guess is that it is unlikely that a portable GPS unit that sustains a serious enough over-voltage condition to kill the power input will keep working on its internal the battery.
If you want a truly independent GPS, it needs to be independent of the aircraft's power bus, which means running it on internal batteries all the time.
Regards,
Hamid
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