Before revision: See 14 CFR Part 21 Subpart URL Similar standards are maintained by other aviation authorities (for example ETSO by EASA for European Union), with limited reciprocal equivalence on a per-country basis URL See also Type certificate Supplemental type certificate References External links FAA page on Technical Standard Orders What is TSO?
After revision: See 14 CFR Part 21 Subpart URL Similar standards are maintained by other aviation authorities (for example European Technical Standard Order (ETSO) by EASA for European Union), with limited reciprocal equivalence on a per-country basis URL See also Type certificate Supplemental type certificate References External links FAA page on Technical Standard Orders What is TSO?