U.S. Code of Federal Regulations

Regulations most recently checked for updates: Dec 14, 2025

All TitlesTitle 14Chapter IPart 21Subpart A - Subpart A—General
§ 21.1 - Applicability and definitions.
§ 21.2 - [Reserved]
§ 21.3 - Reporting of failures, malfunctions, and defects.
§ 21.4 - ETOPS reporting requirements.
§ 21.5 - Airplane or Rotorcraft Flight Manual.
§ 21.6 - Manufacture of new aircraft, aircraft engines, and propellers.
§ 21.7 - Continued airworthiness and safety improvements for transport category airplanes.
§ 21.8 - Approval of articles.
§ 21.9 - Replacement and modification articles.
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