# 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): Non-pressurised helicopters operated above flight altitudes at which the pressure altitude in the passenger compartments is above 10 000 ft shall carry enough breathing oxygen to supply:

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

(1) all crew members and at least 10 % of the passengers for any period in excess of 30 minutes when the pressure altitude in the passenger compartment will be between 10 000 ft and 13 000 ft; and
(2) all crew members and passengers for any period that the pressure altitude in the passenger compartment will be above 13 000 ft.

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Source: https://www.legislation.gov.uk/eur/2012/965/annex/VI/division/subpart+d/division/section+2/division/nccideh200/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-VI/division-subpart+d/division-section+2/division-nccideh200/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.