1161. Review of noise certificates.

The Civil Aviation Authority ('CAA')1 may, if it thinks fit, provisionally suspend a noise certificate2 (or, in the case of a certificate issued in relation to a civil propeller-driven aeroplane3 or a civil subsonic jet aeroplane, provisionally vary the certificate) pending inquiry into or consideration of the case4; and, after sufficient ground being shown to its satisfaction after due inquiry, it may revoke, vary or (in the case of a certificate issued in relation to a microlight aeroplane5, aircraft registered in the United Kingdom which is either a state aircraft or a research aircraft for which there is an