# Commission Regulation (EU) No 965/2012 of 5 October 2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council, Division (a): Helicopters on flights over water shall be equipped with a radio altimeter capable of emitting an audio warning below a pre-set height and a visual warning at a height selectable by the pilot, when operating:

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

(1)out of sight of the land;
(2)in a visibility of less than 1 500 m;
(3)at night; or
(4)at a distance from land corresponding to more than three minutes at normal cruising speed.

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Source: https://www.legislation.gov.uk/eur/2012/965/annex/IV/division/subpart+d/division/section+2/division/catideh145/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-IV/division-subpart+d/division-section+2/division-catideh145/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.