a transponder has to be approved before it can get involved in the US ATC
system....otherwise we'd be using home made toys to mingel with airliners
and fighter jets...the controllers wouldn't appreciate this....but lawyers
might
tim

"Paul Remde" wrote in message
...
Hi,

I am looking forward to selling the Trig TT21 transponder in the USA once
they receive approval from the FAA (or whomever they need approvals from).
However, I just talked to someone who told me that his avionics person
said he could install one in his experimental aircraft - now - even though
the unit is not approved for use in the USA. Can that be true? I don't
think it is, but I'm not certain. I would think it would be illegal to
use it in the USA until it receives US approvals.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.