19. The Governor may cause such inspections, investigations, tests, experiments and flight trials to be made as he deems necessary for the purposes of this Part of this Order and any person authorised to do so in writing by the Governor may at any reasonable time inspect any part of, or material intended to be incorporated in or used in the manufacture of any part of, an aircraft or its equipment or any document relating thereto and may for that purpose go upon any aerodrome or enter any aircraft factory or other premises.