PART 3Amendment of principal EU RegulationsCHAPTER 5Amendment of Regulation (EU) No 2018/1139SECTION 3Substantive requirements – Chapter 3 of Regulation (EU) No 2018/1139SUB-SECTION 5Air Traffic Management / Air Navigation ServicesAmendment of Article 46 of Regulation (EU) No 2018/1139123.Article 46 (design of airspace structures) is amended as follows—(a)for “Member States” substitute “The CAA”;(b)for “the detailed rules adopted by the Commission pursuant to” substitute “regulations made by the Secretary of State under”.