“Therefor it is undesirable that GA is equipped with uncertified ADS-B transponders.”
I am confused by that! In Europe we are using Mode S transponders with extended squitter to emit ADS-B out. I think all the transponders available are certified?
I would have thought that uncertified installations set with SIL=1 would have made the sky much safer than no ADS-B out at all? This appears to work in the US. In the UK I was under the impression that ADS-B was not in use by ATC apart from North Sea helicopters?
Rod1