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Regulations last checked for updates: Dec 15, 2025
Title 14 - Aeronautics and Space last revised: Nov 03, 2025
All Titles
Title 14
Chapter I
Part 121
Subpart H - Subpart H—Aircraft Requirements
§ 121.151 - Applicability.
§ 121.153 - Aircraft requirements: General.
§ 121.155 - [Reserved]
§ 121.157 - Aircraft certification and equipment requirements.
§ 121.159 - Single-engine airplanes prohibited.
§ 121.161 - Airplane limitations: Type of route.
§ 121.162 - ETOPS Type Design Approval Basis.
§ 121.163 - Aircraft proving tests.
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