# 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), Article 4: Performance requirements

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

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Air navigation service providers shall ensure that, at the latest, by 2 January 2020, the cooperative surveillance chain has the necessary capability to allow them to establish individual aircraft identification using the downlinked aircraft identification feature.
3. Air navigation service providers establishing individual aircraft identification using the downlinked aircraft identification feature shall ensure that they comply with the requirements laid down in Annex II.
4. Air navigation service providers establishing individual aircraft identification using discrete SSR codes outside of the airspace defined in Annex I shall ensure that they comply with the requirements laid down in Annex III.
5. Air navigation service providers shall ensure that:
(a) systems referred to in points (b), (c) and (d) of Article 2(1) are deployed as necessary to support the requirements laid down in paragraphs 3 and 4 of this Article;
(b) systems or procedures referred to in points (b), (c) and (d) of Article 2(1) are deployed as necessary to inform controllers when SSR code assignments are unintentionally duplicated.
6. The CAA shall ensure that:
(a) volumes of airspace are declared to the centralised flight planning processing and distribution service referred to in point (1) of Annex II to support the requirements of paragraph 2 of this Article and point (b) of this paragraph;
(b) the integrated initial flight plan processing system communicates to all affected air navigation service providers those flights that are eligible for the use of the conspicuity code referred to in point (c);
(c) a single conspicuity code is ... coordinated with Member States and European third countries for assignment solely to aircraft where individual aircraft identification is established by using the downlinked aircraft identification feature.

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Source: https://www.legislation.gov.uk/eur/2011/1206/article/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-1206/article-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.