(1) An article manufacturer who requests approval to deviate from any performance standard of an ATSO, ETSO or TSO must show that the standards from which a deviation is requested are compensated for by factors or design features providing an equivalent level of safety.
(2) The request for approval to deviate, together with all pertinent data, must be submitted to CASA. If the article is manufactured in another country, the request for approval to deviate, together with all pertinent data, must be submitted to CASA through the national aviation authority of that country.
(3) Subject to regulation 11.055, CASA must grant the approval.
Source FARs section 21.609 modified.