14 CFR §21.329

1. (a)A person may obtain from the FAA an export certificate of airworthiness for an aircraft if—
   1. (1)A new or used aircraft manufactured under subpart F or G of this part meets the requirements under subpart H of this part for a—
      1. (i)Standard airworthiness certificate; or
      2. (ii)Special airworthiness certificate in either the “primary” or the “restricted” category; or
   2. (2)A new or used aircraft not manufactured under subpart F or G of this part has a valid—
      1. (i)Standard airworthiness certificate; or
      2. (ii)Special airworthiness certificate in either the “primary” or the “restricted” category.
2. (b)An aircraft need not meet a requirement specified in paragraph (a) of this section, as applicable, if—
   1. (1)The importing country or jurisdiction accepts, in a form and manner acceptable to the FAA, a deviation from that requirement; and
   2. (2)The export certificate of airworthiness lists as an exception any difference between the aircraft to be exported and its type design.