# 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 (b): Pressurised aeroplanes operated at pressure altitudes above 25 000 ft shall be equipped with:

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

(1)quick donning types of masks for flight crew members;
(2)sufficient spare outlets and masks or portable oxygen units with masks distributed evenly throughout the passenger compartment, to ensure immediate availability of oxygen for use by each required cabin crew member;
(3)an oxygen dispensing unit connected to oxygen supply terminals immediately available to each cabin crew member, additional crew member and occupants of passenger seats, wherever seated; and
(4)a device to provide a warning indication to the flight crew of any loss of pressurisation.

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Source: https://www.legislation.gov.uk/eur/2012/965/annex/IV/division/subpart+d/division/section+1/division/catidea235/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-IV/division-subpart+d/division-section+1/division-catidea235/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.