# The Air Navigation (Environmental Standards For Non-EASA Aircraft) Order 2008, Article 11: Validity of noise certificate


(1) Subject to paragraph (2) and article 22, a noise certificate issued under article 8, 9 or 10 remains in force without limit of time.
(2) A noise certificate issued under article 8, 9 or 10 ceases to be valid for the purposes of article 4, 6 or 7—
(a) if the aircraft or any part of it is modified in any way which affects the ability of the aircraft to comply with the noise standards required by this Order, unless such modification is in a manner and with material of a type approved by the CAA for the purposes of this Part either generally or in relation to a class of aircraft or to a particular aircraft;
(b) until the satisfactory completion of any inspection or test of the aircraft required by the CAA to be made for the purpose of ascertaining whether the aircraft continues to comply with the noise standards required by this Order.

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Source: https://www.legislation.gov.uk/ukdsi/2008/9780110843773/article/11 (the official version)
Page: https://openlegislation.uk/draft-air-navigation-environmental-standards-for-non-easa-aircraft-order-2008/article-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.