That’s not the point. The point is that for homebuilt and vintage there exist an international treaty which all ECAC states have agreed. Now, if each state actually recognize this (locally), and put’s it in the AIP, is very much up to the pilots living in those states lobbying for it, international pilot organisation (EFLEVA), and the local authority.
For UL there is nothing, even though UL is defined by EASA. Some states simply don’t care (Sweden, Finland). Other states requires an application to be sent, while others again have mutual agreements with some. There is no international agreement for UL, not within EASA, not within ECAC, nowhere. This is rather odd, but it’s something to be aware of.
To answer the question:
No UL or Annex II (now Annex 1) flights into Austria – could someone confirm ?
I repeat
I spoke to Austrocontrol.
UL from mentioned 6 countries above and ECAC territory registered experimental do not need approval to fly within austria.
All others need approval according Paragraph 18. it is valid for one year or when arc/insurance runs out, whichever is earlier.