The development and introduction of new technologies and digitisation necessitate that safety-related aerodrome equipment and ground ATM/ANS systems and constituents demonstrate compliance with the relevant requirements for safety, performance, and interoperability in order to ensure the proper functioning of the European ATM network. Regulation (EU) 2018/1139 stipulates the use of harmonised and mutually recognised mechanisms to attest compliance and foresees the creation of a framework of detailed rules and provisions.