Originally Posted by IO540
However, the biggest problem with any form of TCAS is that when flying OCAS most targets are non transponding. Lots of planes don't have a transponder. Also, lots of pilots have one but choose to exercise their civil liberties
by not switching theirs on. This also enables them to bust airspace (vertically) without getting caught, which is really smart (not).
I'm not sure you can make that logic - some pilots don't switch on their transponders properly because
a) they are not taught to use ALT
b) it may be inoperative, and transponding is not yet mandatory
c) there may be an electrical load issue
d) they may just have forgotten
..and yes, some do it because they are unsure of their ability not to fly into CAS, although why, I can't imagine