# 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 (a): Wake turbulence separation minima shall be applied to aircraft in the approach and departure phases of flight under the following circumstances:

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

(1) an aircraft is operating directly behind another aircraft at the same altitude or less than 300 m ( 1 000 ft) below it; or
(2) both aircraft are using the same runway or parallel runways separated by less than 760 m ( 2 500 ft); or
(3) an aircraft is crossing behind another aircraft at the same altitude or less than 300 m ( 1 000 ft) below it.

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Source: https://www.legislation.gov.uk/eur/2012/923/annex/section/8/division/SERA.8012/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-923/annex/section-8/division-SERA.8012/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.