Hey Planemad, long time no see,
Not sure where the rules are, never been real good on the books
but I can tell ya from experience testing the squelch regularly is a very good habit to get into. Not just to make sure you can hear ATC or other aircraft, but also to be sure to know that you do not have an open mike, especialy if like me you tend to have little 'sing songs' on those long lonely flights, saves lots of embarrassing moments when you get back to a crew room.
Pete Fanelli
At the risk of offending the poor darlings
None taken mate, I got a little over 300 hrs these days, and still building
DD
PS re, what the DrKiller said,,,,,,,,,,, I Concur