Regulation (EU) No 1321/2014
(a) For the purpose of this Annex (Part-66), the competent authority shall be:
1. the authority designated by the Member State to whom a person first applies for the issuance of an aircraft maintenance licence; or
2. the authority designated by another Member State, in case it would be different, subject to agreement with the authority referred to in point 1. In that case, the licence referred to in point 1 shall be revoked, all the records mentioned in point 66.B.20 shall be transferred and a new licence shall be issued on the basis of these records.
(b) The Agency shall be responsible for defining:
1. the list of aircraft types; and
2. what airframe/engine combinations are included in each particular aircraft type rating.