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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 I - Subpart I—Airplane Performance Operating Limitations
§ 121.171 - Applicability.
§ 121.173 - General.
§ 121.175 - Airplanes: Reciprocating engine-powered: Weight limitations.
§ 121.177 - Airplanes: Reciprocating engine-powered: Takeoff limitations.
§ 121.179 - Airplanes: Reciprocating engine-powered: En route limitations: All engines operating.
§ 121.181 - Airplanes: Reciprocating engine-powered: En route limitations: One engine inoperative.
§ 121.183 - Part 25 airplanes with four or more engines: Reciprocating engine powered: En route limitations: Two engines inoperative.
§ 121.185 - Airplanes: Reciprocating engine-powered: Landing limitations: Destination airport.
§ 121.187 - Airplanes: Reciprocating engine-powered: Landing limitations: Alternate airport.
§ 121.189 - Airplanes: Turbine engine powered: Takeoff limitations.
§ 121.191 - Airplanes: Turbine engine powered: En route limitations: One engine inoperative.
§ 121.193 - Airplanes: Turbine engine powered: En route limitations: Two engines inoperative.
§ 121.195 - Airplanes: Turbine engine powered: Landing limitations: Destination airports.
§ 121.197 - Airplanes: Turbine engine powered: Landing limitations: Alternate airports.
§ 121.198 - Cargo service airplanes: Increased zero fuel and landing weights.
§ 121.199 - Nontransport category airplanes: Takeoff limitations.
§ 121.201 - Nontransport category airplanes: En route limitations: One engine inoperative.
§ 121.203 - Nontransport category airplanes: Landing limitations: Destination airport.
§ 121.205 - Nontransport category airplanes: Landing limitations: Alternate airport.
§ 121.207 - Provisionally certificated airplanes: Operating limitations.
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