# 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): Except as provided by (e), at night all aircraft in flight shall display:

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

(1)anti-collision lights intended to attract attention to the aircraft; and
(2)except for balloons, navigation lights intended to indicate the relative path of the aircraft to an observer. Other lights shall not be displayed if they are likely to be mistaken for these lights.
(3)...

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Source: https://www.legislation.gov.uk/eur/2012/923/annex/section/3/chapter/2/division/SERA.3215/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-923/annex/section-3/chapter-2/division-SERA.3215/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.