# Commission Implementing Regulation (EU) No 1206/2011 of 22 November 2011 laying down requirements on aircraft identification for surveillance for the single European sky (Text with EEA relevance), Division 7: Formal arrangements with the following minimum content shall be established with neighbouring air navigation service providers that are establishing individual aircraft identification by using discrete SSR codes:

Extent: E+W+S+N.I.

(a)an obligation on the neighbouring air navigation service providers to transfer aircraft with verified discrete SSR codes assigned in compliance with a code allocation list agreed by the United Kingdom and Member States and coordinated with European third countries;
(b)an obligation to notify accepting units about any observed irregularity in the operation of airborne constituents of surveillance systems.

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Source: https://www.legislation.gov.uk/eur/2011/1206/annex/II/division/7 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-1206/annex-II/division-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.