20.—(1) A non-EASA aircraft must not land or take off in the United Kingdom unless it carries every noise certificate which it is required to carry under the law of the country in which it is registered.
(2) Subject to paragraph (3), a non-EASA aircraft registered in the United Kingdom must, when in flight, carry every noise certificate which is required by this Order to be in force in respect of that aircraft.
(3) If a flight by a non-EASA aircraft registered in the United Kingdom is intended to begin and end at the same aerodrome in the United Kingdom, the certificate which is required by this Order to be in force in respect of that aircraft may be kept at that aerodrome instead of being carried in the aircraft.
21.—(1) Within a reasonable time after being requested to do so by the CAA or by an authorised person, the commander of an aircraft must cause to be produced to the CAA or to that person every noise certificate in force in respect of that aircraft which is required to be carried under this Order.
(2) Within a reasonable time after being requested to do so by the CAA or by an authorised person, the operator of an aircraft must cause to be produced to the CAA or to that person every noise certificate in force in respect of that aircraft which is required to be carried under this Order.
22.—(1) The CAA may, if it thinks fit, provisionally suspend any noise certificate or exemption issued under Part 2 pending inquiry into or consideration of the case.
(2) The CAA may, after sufficient ground being shown to its satisfaction after due inquiry, revoke, suspend or vary any such certificate or exemption.
(3) The holder or any person having the possession or custody of any noise certificate or exemption which has been revoked, suspended or varied under paragraph (2) must surrender it to the CAA within a reasonable time after being required to do so by the CAA.
(4) The breach of any condition subject to which any noise certificate or exemption has been issued under Part 2 renders the certificate or exemption invalid during the continuance of the breach.