21.—(1) In this article, a certificate of validation means a certificate authorising an aircraft registered elsewhere than in the Isle of Man to fly in or over the Isle of Man.
(2) The Department must issue a certificate of validation if it is satisfied that the aircraft has a permit to fly or equivalent document issued or validated by the competent authority of the country in which the aircraft is registered and the authority applies standards that are substantially equivalent to those required for the issue of a permit to fly by the Department.
(3) An aircraft flying in accordance with a certificate of validation must not fly for the purpose of —
(a)commercial air transport; or
(b)aerial work other than aerial work that consists of flights for flying displays, associated practice, test and positioning flights or the exhibition or demonstration of the aircraft.
(4) The Department may issue a certificate of validation subject to such conditions relating to the airworthiness, operation or maintenance of the aircraft as it thinks fit.