# 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 (b): Clearances issued by air traffic control units shall provide separation:

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

(1)between all flights in airspace Classes A and B;
(2)between IFR flights in airspace Classes C, D and E;
(3)between IFR flights and VFR flights in airspace Class C;
(4)between IFR flights and special VFR flights;
(5)between special VFR flights unless otherwise prescribed by the competent authority;
except that, when requested by the pilot of an aircraft and agreed by the pilot of the other aircraft and if so prescribed by the competent authority for the cases listed under b) above in airspace Classes D and E, a flight may be cleared subject to maintaining own separation in respect of a specific portion of the flight below 3 050 m (10 000 ft) during climb or descent, during day in visual meteorological conditions.

---
Source: https://www.legislation.gov.uk/eur/2012/923/annex/section/8/division/SERA.8005/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-923/annex/section-8/division-SERA.8005/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.