"Andrew Sarangan" wrote in message
...

The spirit of the original transponder exemption was to allow for
older airplanes that were manufactured before the days electrical
avionics became commonplace. So I can see the justification for this
proposal. However, a full blown mode C transponder may not be
necessary. A radar reflector like they use on weather balloon ought be
sufficient. It is just a piece of foil with a large cross section.


And might present a small target or none at all on an ATC display using
ARSR. That assumes the ARSR has primary radar to begin with, some are just
beacon interrogators.