http://www.legislation.gov.uk/ukpga/1990/31/schedule/1/crossheading/air-navigation-installations/enactedAviation and Maritime Security Act 1990InspectionsKing's Printer of Acts of Parliament2021-08-02SCHEDULESSCHEDULE 1Further amendments of the Aviation Security Act 1982Air navigation installations121Section 21 (air navigation installations) is amended as follows.2In subsection (1) after “13,” there is inserted “13A,”.3In subsection (7) after “18(1)” there is inserted “, 18A, 18B, 18E”.