http://www.legislation.gov.uk/eur/2010/255/article/4Commission Regulation (EU) No 255/2010 of 25 March 2010 laying down common rules on air traffic flow management (Text with EEA relevance)Commission Regulation (EU) No 255/2010Commission Regulation (EU) No 255/2010 of 25 March 2010 laying down common rules on air traffic flow management (Text with EEA relevance)King's Printer of Acts of Parliamenthttps://webarchive.nationalarchives.gov.uk/eu-exit/https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02010R0255-20171211texttext/xmlen2025-02-14Expert Participation2020-12-31 General obligations of <Substitution ChangeId="key-7ed6b71f81e7b27d6a9bc096ae452329-1739181562000" CommentaryRef="key-7ed6b71f81e7b27d6a9bc096ae452329">the Secretary of State</Substitution>Article 41The Secretary of State shall ensure that the ATFM function is available to parties referred to in Article 1(3) on a 24 hour basis.2The definition and implementation of ATFM measures shall be compatible with ... security and defence requirements, in order to ensure efficiency in airspace planning, allocation and use for the benefit of parties referred in Article 1(3).3Consistent procedures shall be established for the cooperation between the parties involved in ATFM function, ATS units and entities involved in airspace management, in order to optimise the use of the airspace.4... Where applicable, publication of route availability in national aeronautical information publications shall be fully consistent with the common reference document created by Eurocontrol containing the policies, procedures and description for route and traffic orientation.5Common procedures for requesting exemption from an ATFM departure slot shall be drawn up in accordance with the ICAO provisions specified in the Annex. The Secretary of State must endeavour to ensure that those procedures are coordinated with the central unit for ATFM and published in national aeronautical information publications.Words in Art. 4 heading substituted (31.12.2020) by The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/459), regs. 1(2), 175(2); 2020 c. 1, Sch. 5 para. 1(1)Words in Art. 4(1) substituted (31.12.2020) by The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/459), regs. 1(2), 175(3); 2020 c. 1, Sch. 5 para. 1(1)Words in Art. 4(2) omitted (31.12.2020) by virtue of The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/459), regs. 1(2), 175(4); 2020 c. 1, Sch. 5 para. 1(1)Words in Art. 4(4) omitted (31.12.2020) by virtue of The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/459), regs. 1(2), 175(5)(a); 2020 c. 1, Sch. 5 para. 1(1)Words in Art. 4(4) substituted (31.12.2020) by The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/459), regs. 1(2), 175(5)(b); 2020 c. 1, Sch. 5 para. 1(1)Words in Art. 4(5) substituted (31.12.2020) by The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/459), regs. 1(2), 175(6); 2020 c. 1, Sch. 5 para. 1(1)