# The Air Navigation Order 2016, Paragraph 1


Subject to the conditions set out in paragraph 3, a non-Part-21 aircraft registered in the United Kingdom of not more than 2,000kg maximum take-off mass and which is designed to be flown by a crew of at least one pilot may fly for a purpose set out in paragraph 2 when there is in force neither—
(a) a certificate of airworthiness duly issued or rendered valid under the law of the United Kingdom; nor
(b) a permit to fly.

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Source: https://www.legislation.gov.uk/uksi/2016/765/schedule/3/part/1/chapter/3/paragraph/1 (the official version)
Page: https://openlegislation.uk/air-navigation-order-2016/schedule-3/part-1/chapter-3/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.