Audio panel & live mic


Well-Known Member
In our planes, we have a Garmin GMA340 audio panel connected to a GNS430 Nav/com. When I press my push-to-talk switch, which mics are live? Mine, or both pilots? I frequently run into situations where my student is verbally talking through a checklist when I need to talk to ATC, and wonder if both mics are live.


Well-Known Member
We have the same setup in one of the Bonanzas that I fly. The only mic that is open, is the one on the side where the PTT is pushed. Try talking when they are transmitting sometime, you'll notice that you can't even hear yourself on the intercom. Its completely locked out.