# Commission Implementing Regulation (EU) No 923/2012 of 26 September 2012 laying down the common rules of the air and operational provisions regarding services and procedures in air navigation and amending Implementing Regulation (EU) No 1035/2011 and Regulations (EC) No 1265/2007, (EC) No 1794/2006, (EC) No 730/2006, (EC) No 1033/2006 and (EU) No 255/2010 (Text with EEA relevance), Division (f): As soon as an air traffic services unit learns that an aircraft is being intercepted in its area of responsibility, it shall take such of the following steps as are appropriate in the circumstances:

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

(1)attempt to establish two-way communication with the intercepted aircraft via any means available, including the emergency radio frequency 121,5 MHz, unless such communication already exists;
(2)inform the pilot of the intercepted aircraft of the interception;
(3)establish contact with the intercept control unit maintaining two-way communication with the intercepting aircraft and provide it with available information concerning the aircraft;
(4)relay messages between the intercepting aircraft or the intercept control unit and the intercepted aircraft, as necessary;
(5)in close coordination with the intercept control unit take all necessary steps to ensure the safety of the intercepted aircraft;
(6)inform air traffic services units serving adjacent flight information regions if it appears that the aircraft has strayed from such adjacent flight information regions.

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Source: https://www.legislation.gov.uk/eur/2012/923/annex/section/11/division/SERA.11015/division/f (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-923/annex/section-11/division-SERA.11015/division-f
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.