# 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 (b): The aerodrome operator shall:

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

(1)maintain the surfaces of all movement areas with the objective of avoiding and eliminating any loose object/debris that might cause damage to aircraft or impair the operation of aircraft systems;
(2)maintain the surface of runways, taxiways and aprons in order to prevent the formation of harmful irregularities;
(3)take corrective maintenance action when the friction characteristics for either the entire runway or a portion thereof, when uncontaminated, are below a minimum friction level. The frequency of these measurements shall be sufficient to determine the trend of the surface friction characteristics of the runway.

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Source: https://www.legislation.gov.uk/eur/2014/139/annex/IV/division/3/division/2/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-139/annex-IV/division-3/division-2/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.