# The Air Navigation Order 2016, Paragraph 2


References in this Order to—
(a) a certificate of airworthiness include both a national certificate of airworthiness and a Part-21 certificate of airworthiness unless otherwise stated;
(b) an aircraft, aeroplane, powered lift tilt rotor aircraft, SLMG, helicopter, gyroplane, airship, balloon or kite include both Part-21 and non-Part-21 examples of the same unless otherwise stated.

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Source: https://www.legislation.gov.uk/uksi/2016/765/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/air-navigation-order-2016/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.