# Commission Implementing Regulation (EU) No 1079/2012 of 16 November 2012 laying down requirements for voice channels spacing for the single European sky (Text with EEA relevance), Division 9: If the CAA converts frequency assignments to 8,33 kHz channel spacing in any part of the airspace under the responsibility of the United Kingdom it must:

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

(a)ensure that operators of aircraft operating in such airspace are informed that these aircraft must be equipped with radios having the 8,33 kHz channel spacing capability;
(b)ensure that appropriate training is provided to flight crew members that use 25 kHz radios in airspace where the carriage of radios having the 8,33 kHz channel spacing capability is required, as specified in Article 2(5);
(c)perform a local safety assessment prior to the conversion that takes into account all the traffic expected to cross that airspace and the potential issues arising from the voice communication system in operation in all surrounding airspace.

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Source: https://www.legislation.gov.uk/eur/2012/1079/annex/III/division/9 (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-1079/annex-III/division-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.