# Commission Implementing Regulation (EU) No 1207/2011 of 22 November 2011 laying down requirements for the performance and the interoperability of surveillance for the single European sky (Text with EEA relevance), Division 5: The data source connected to the transponder and providing the data items in point 3(h) and (i) shall meet the following data integrity requirements:

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

(a) horizontal position (data item in point 3(h)) source integrity level (SIL, expressed with respect to NIC) shall be equal to or less than 10-7 per flight-hour;
(b) horizontal position (data item in point 3(h)) integrity time to alert (leading to a change of the NIC quality indicator), if on-board monitoring is required to meet the horizontal position source integrity level, shall be equal to or less than 10 seconds.

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Source: https://www.legislation.gov.uk/eur/2011/1207/annex/II/part/2/division/5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-1207/annex-II/part-2/division-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.