U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

§ 25.1 - Applicability.

(a) This part prescribes airworthiness standards for the issue of type certificates, and changes to those certificates, for transport category airplanes.

(b) Each person who applies under Part 21 for such a certificate or change must show compliance with the applicable requirements in this part.