With most modern audio panels, when they fail, you still have a connection
to the mic and headset jacks on the #1 COM. You can test this by simply
turning the audio panel "off" and seeing if the #1 COM works.

I have also heard of aircraft that have a "backup" set of jacks that are
directly connected to the #1 COM, bypassing the audio panel entirely.

It might be worth a little time to fully familiarize yourself with the
various audio panels you might encounter....



wrote in message
oups.com...
At first I read this as the master, but I think you meant the avionics
master. Did any radio lights come on? Did the transponder do its
transponder blikey thing?

It was the avionics master, yes. Everything but the audio panel came
back on - the radio were just fine, but with a dead audio panel there's
no way to use them!