# The Air Navigation Order 2000, Paragraph 4: Period of validity of certificate of test


(a) (i) Subject to sub-paragraph (ii), a certificate of test required by article 23(2) of this Order in respect of a Commercial Pilot’s Licence (Balloons) shall not be valid in relation to a flight made more than 13 months after the date of the test which it certifies and, in respect of any other licence, shall not be valid in relation to a flight made more than 13 months in Cases A, B and E or more than 6 months in Cases C and D after the date of the test which it certifies.
(ii) In the case of Cases C and D, 2 certificates of test shall together be deemed to constitute a valid certificate of test if they certify flying tests conducted on 2 occasions within the period of 13 months preceding the flight on which the functions are to be performed, such occasions being separated by an interval of not less than 4 months, and if both certificates are appropriate to those functions.
(b) (i) A certificate of test required by article 25(1) of this Order in respect of an instrument meteorological conditions rating (aeroplanes) shall not be valid in relation to a flight made more than 25 months after the date of the test which it certifies.
(ii) A certificate of test required by article 25(1) of this Order in respect of an assistant flying instructor’s rating (gyroplanes) and a flying instructor’s rating (gyroplanes) shall not be valid in relation to a flight made more than 3 years after the date of the test which it certifies.

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Source: https://www.legislation.gov.uk/uksi/2000/1562/schedule/8/paragraph/4 (the official version)
Page: https://openlegislation.uk/air-navigation-order-2000/schedule-8/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.