# The Air Navigation Order 2016, Article 51: Other circumstances in which an aircraft must not fly

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

An aircraft with a national certificate of airworthiness must not fly if—
(a) the continuing airworthiness of the aircraft or any component fitted to the aircraft does not meet the requirements of this Part;
(b) the aircraft does not remain in conformity with the type design approved by the CAA;
(c) the aircraft has been operated beyond the limitations of the approved flight manual or the airworthiness certificate, without subsequent appropriate action to restore airworthiness being taken;
(d) the aircraft has been involved in an accident or incident that affects the airworthiness of the aircraft, without subsequent appropriate action to restore airworthiness being taken; or
(e) the aircraft has a modification or repair for which a certificate or release to service has not been issued in accordance with this Order.

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Source: https://www.legislation.gov.uk/uksi/2016/765/article/51 (the official version)
Page: https://openlegislation.uk/air-navigation-order-2016/article-51
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.