The national aviation authority will issue a certificate of airworthiness (CoA) for the aircraft in the state in which it is registered.
The CoA attests that the aircraft is airworthy and conforms to its type design.
For EASA member states, an aircraft is issued a certificate of airworthiness that is non-expiring but is validated annually with an Airworthiness Review Certificate (ARC).
The ARC review can be performed by a Continuing Airworthiness Management Organisation (CAMO) with Part M Subpart I approval.
An ARC review is performed annually and a “full” ARC takes place every third year.