# Commission Implementing Regulation (EU) 2019/123 of 24 January 2019 laying down detailed rules for the implementation of air traffic management (ATM) network functions and repealing Commission Regulation (EU) No 677/2011 (Text with EEA relevance), Division 13: When assigning the frequency to the applicant, the national frequency manager shall include conditions of use. As a minimum, those conditions shall specify that the frequency assignment:

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

(a)remains valid as long as it is being used to meet the operational requirements described by the applicant;
(b)may be subject to a frequency shift request and that such shifts will need to be implemented within a limited timeframe;
(c)is subject to modification once the operational use described by the applicant changes.

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Source: https://www.legislation.gov.uk/eur/2019/123/annex/III/part/B/division/13 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-123/annex-III/part-B/division-13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.