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123.—(1) Unless otherwise authorised by the appropriate air traffic control unit an aircraft registered elsewhere than in the United Kingdom must not fly in Reduced Vertical Separation Minimum airspace in the United Kingdom unless—
(a)it is so equipped with height keeping systems as to comply with the law of the country in which the aircraft is registered in so far as that law requires it to be so equipped when flying in any specified airspace; and
(b)the equipment is capable of being operated so as to enable the aircraft to maintain the height keeping performance prescribed for the airspace in which the aircraft is flying, and it is so operated.