"Ron Natalie" wrote in message
. ..

Nobody said it had to be universal. You asked "what bizarre failure
causes
you to lose comm and transponder and still leaves you confident that your
other avionics (presumably navigational gear) active?" And the answer is
that most of us carry a GPS that is entirely independent of the aircraft
electrical system. I've been twice in two different aircraft that have
had the electrical
systems go dead (and in the case of mine, we had several failures in a
row).
One was even IFR. In one case I had a GPS (and no backup comm) in the
other case I had backup COMM (without NAV).


Follow the damn thread. The question was directed at someone who
hypothesized losing comm radios and transponder but did not lose the nav
radios.