 In order to obtain a PMA from the FAA, the manufacturer must demonstrate that it has

The manufacturers that meet these standards are issued Parts Manufacturer Approval (PMA) by the FAA.Because the United States was the first nation to adopt rules permitting the manufacture of aircraft after market parts (and for many decades was the only nation with these rules), the PMA industry is primarily concentrated in the United States.Other countries have started to investigate and even adopt PMA rules.