# Commission Regulation (EU) No 139/2014 of 12 February 2014 laying down requirements and administrative procedures related to aerodromes pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council (Text with EEA relevance), Division (a): The aerodrome operator shall monitor on the aerodrome and its surroundings:

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

(1)obstacle limitation and protection surfaces as established in accordance with the certification basis, and other surfaces and areas associated with the aerodrome, in order to take, within its competence, appropriate action to mitigate the risks associated with the penetration of those surfaces and areas;
(2)marking and lighting of obstacles in order to be able to take action within its competence, as appropriate; and
(3)hazards related to human activities and land use in order to take action within its competence, as appropriate.

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Source: https://www.legislation.gov.uk/eur/2014/139/annex/IV/division/2/division/15/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-139/annex-IV/division-2/division-15/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.