Ron Natalie wrote:


Turning it off if you've got a working one is stupid. There was a midair a few
years back (Atlanta area if I remember) that involved one aircraft who INTENTIONALLY
shut off his transponder. Might it have been avoided with ATC getting mode C from
both? Who knows, but the rules are pretty clear.

Mine goes as part of my pretakeoff checks (set DG, Strobes on, pump on, transponder on).

And mine never gets turned off. If the avionics master is on the
transponder is on. There's no reason to turn it off if it is operating
properly.