Originally Posted by
His dudeness
This is a good question. There is an exemption list by the EU-commission, but apparently Eurocontrol (!) lobbies for more exemptions. Partly, because the stuff not really works well, I was told.
Now I put that question forward to Eurocontrol for "my" aircraft (C680) which is not exempt by that list although Cessna had an exemption years ago. Waiting now for roughly 3 weeks, but the guy is on leave right now.... and there is no CPDLC solution for my aircraft at least now. Eurocontrol moved my question to the EU-Commision by the way....
Unless told otherwise then I think EU 2015/310 seems to be the definitive version of what is and isn't exempt.