An experimental certificate may be issued for one or more of the following purposes:
(a) research and development: for example testing new aircraft design concepts, new aircraft equipment, new aircraft installations, new aircraft operating techniques, or new uses for aircraft;
(b) showing compliance with regulations: for example conducting flight tests and other operations to show compliance with the airworthiness regulations including flights to show compliance for issue of type and supplemental type certificates, flights to substantiate major design changes, and flights to show compliance with the function and reliability requirements of the regulations;
(c) training the applicant's flight crew;
(d) exhibition: for example exhibiting the aircraft's flight capabilities, performance, or unusual characteristics at air shows, motion picture, television, and similar productions, and the maintenance of exhibition flight proficiency, including (for persons exhibiting aircraft) flying to and from such air shows and productions;
(e) air racing: for example participating in air races, including (for participants) practising for air races and flying to and from racing events;
(f) market surveys: for example use of aircraft for purposes of conducting market surveys, sales demonstrations, and customer crew training only as provided in regulation 21.195;
(g) operating an amateur-built aircraft: that is an aircraft the major portion of which has been fabricated and assembled by a person who undertook the construction project solely for the person's own education or recreation;
(h) operating a kit-built aircraft: that is an aircraft in the primary category that meets the criteria of paragraph 21.024(1)(a) and that was assembled by a person from a kit manufactured by the holder of a production certificate for that kit, without the supervision and quality control of the production certificate holder under subregulation 21.184(1);
(i) private operations of prototype aircraft previously certificated under paragraph 21.191(a), (b) or (d);
(j) operating a light sport aircraft that:
(i) has been assembled from a kit in relation to which the applicant can give the information, statement and documents required by paragraph 21.193(e); and
(ii) has been assembled in accordance with the kit manufacturer's instructions for assembling the aircraft; and
(iii) is of the same make and model as a production aircraft covered by regulation 21.186 that has been issued with a special certificate of airworthiness;
(k) operating any other light sport aircraft covered by regulation 21.186 for which a special certificate of airworthiness for light sport aircraft, or another document of similar effect under a law of a Contracting State, has been issued.
Source FARs section 21.191 modified.