Contact MARPA at (202) 628-6777 or email MARPA@PMAparts.org for more information! MARPA is an association of aviation industry replacement and alteration part manufacturers who obtain appropriate civil aviation design and production approvals for their parts. MARPA's number one priority is aviation safety. MARPA promotes the free enterprise competitive nature of producing and selling high-quality and safe parts through uniform standards; represents the membership on regulatory issues; and enhances members reputations by communicating the value of their parts.