U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 11, 2026

All TitlesTitle 14Chapter IPart 121Subpart J - Subpart J—Special Airworthiness Requirements
§ 121.211 - Applicability.
§ 121.213 - [Reserved]
§ 121.215 - Cabin interiors.
§ 121.217 - Internal doors.
§ 121.219 - Ventilation.
§ 121.221 - Fire precautions.
§ 121.223 - Proof of compliance with § 121.221.
§ 121.225 - Propeller deicing fluid.
§ 121.227 - Pressure cross-feed arrangements.
§ 121.229 - Location of fuel tanks.
§ 121.231 - Fuel system lines and fittings.
§ 121.233 - Fuel lines and fittings in designated fire zones.
§ 121.235 - Fuel valves.
§ 121.237 - Oil lines and fittings in designated fire zones.
§ 121.239 - Oil valves.
§ 121.241 - Oil system drains.
§ 121.243 - Engine breather lines.
§ 121.245 - Fire walls.
§ 121.247 - Fire-wall construction.
§ 121.249 - Cowling.
§ 121.251 - Engine accessory section diaphragm.
§ 121.253 - Powerplant fire protection.
§ 121.255 - Flammable fluids.
§ 121.257 - Shutoff means.
§ 121.259 - Lines and fittings.
§ 121.261 - Vent and drain lines.
§ 121.263 - Fire-extinguishing systems.
§ 121.265 - Fire-extinguishing agents.
§ 121.267 - Extinguishing agent container pressure relief.
§ 121.269 - Extinguishing agent container compartment temperature.
§ 121.271 - Fire-extinguishing system materials.
§ 121.273 - Fire-detector systems.
§ 121.275 - Fire detectors.
§ 121.277 - Protection of other airplane components against fire.
§ 121.279 - Control of engine rotation.
§ 121.281 - Fuel system independence.
§ 121.283 - Induction system ice prevention.
§ 121.285 - Carriage of cargo in passenger compartments.
§ 121.287 - Carriage of cargo in cargo compartments.
§ 121.289 - Landing gear: Aural warning device.
§ 121.291 - Demonstration of emergency evacuation procedures.
§ 121.293 - Special airworthiness requirements for nontransport category airplanes type certificated after December 31, 1964.
§ 121.295 - Location for a suspect device.
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