What are the requirements to fly with an EC-registration ULM to another EU country?

Royal Decree 2876/1982 regulates the use of ultra-light-structured aircraft (ULMs) in national airspace only, so that AESA is not competent to issue permit/flight authorisation in other States.

Since the legislation applicable to this type of aircraft is regulated by each State, it is considered that, in the event that an aircraft with an ultra-light structure goes on a flight to another State, it will be necessary to comply with the provisions governing that territory of ULMs, as required by Article 40 of the Convention on International Civil Aviation.

It must therefore have a prior authorisation to perform the flight of the State in which the flight is to take place. The need for such authorisation by the other State is due to the fact that aircraft with an ultra-light structure do not comply with the requirements of Annex 8 to the Chicago Convention (as regards airworthiness) or with Annex I to the Chicago Convention (as regards pilot licence), and therefore these aircraft are regulated within the national framework of each country.

You can find more information regarding the applicable regulations for General and Sport Aviation at this link.