No person may produce a modification or replacement article for sale for installation on a type-certificated product (an aircraft, engine, or propeller) unless this article is produced in accordance with a PMA issued by the FAA under 14 CFR part 21, Subpart K (sections 21.301 through 21.320).
Examples of exceptions to the PMA rules for producing modification and replacement articles
Page Last Modified: 07/03/12 12:49 EDT
This page can be viewed online at: http://www.faa.gov/aircraft/air_cert/design_approvals/pma/pma_des/pma_des_auth/