# 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 (e): The crew member shall not undertake duties on an aircraft:

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

(1) if he/she knows or suspects that he/she is suffering from fatigue as referred to in 7.f. of Annex IV to Regulation (EC) No 216/2008 or feels otherwise unfit to perform his/her duties; or
(2) when under the influence of psychoactive substances or alcohol or for other reasons as referred to in 7.g. of Annex IV to Regulation (EC) No 216/2008.

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Source: https://www.legislation.gov.uk/eur/2012/965/annex/VIII/division/subpart+a/division/spogen105/division/e (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-VIII/division-subpart+a/division-spogen105/division-e
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.