Air Navigation Order
Article 144
Power to prevent aircraft flying
144 (1) If it appears to the CAA or an authorised person that any aircraft is intended or likely to be flown:
(a) in such circumstances that any provision of article 3, 5, 6, 8, 25, 26, 43, 62, 69, 70 or 75(2) of this order would be contravened in relation to the flight;
(b) in such circumstances that the flight would be in contravention of any other provision of this Order, of any regulations made thereunder or of Part 21, 145 or M and be a cause of danger to any person or property whether or not in the aircraft;
the CAA or that authorised person may direct the operator or the commander of the aircraft that he is not to permit the aircraft to make the particular flight or any other flight of such description as may be specified in the direction, until the direction has been revoked by the CAA or by an authorised person, and the CAA or that authorised person may take such steps as are necessary to detain the aircraft.