StacksVerified U.S. regulatory reference

14 CFR §27.391

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each auxiliary rotor, each fixed or movable stabilizing or control surface, and each system operating any flight control must meet the requirements of §§ 27.395, 27.397, 27.399, 27.411, and 27.427.