Code of Federal Regulations > Title 14 > Chapter I > Part 121 > Subpart K - Subpart K—Instrument and Equipment Requirements

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

§ 121.301 - Applicability.

§ 121.303 - Airplane instruments and equipment.

§ 121.305 - Flight and navigational equipment.

§ 121.306 - Portable electronic devices.

§ 121.307 - Engine instruments.

§ 121.308 - Lavatory fire protection.

§ 121.309 - Emergency equipment.

§ 121.310 - Additional emergency equipment.

§ 121.311 - Seats, safety belts, and shoulder harnesses.

§ 121.312 - Materials for compartment interiors.

§ 121.313 - Miscellaneous equipment.

§ 121.314 - Cargo and baggage compartments.

§ 121.315 - Cockpit check procedure.

§ 121.316 - Fuel tanks.

§ 121.318 - Public address system.

§ 121.319 - Crewmember interphone system.

§ 121.321 - Operations in icing.

§ 121.323 - Instruments and equipment for operations at night.

§ 121.325 - Instruments and equipment for operations under IFR or over-the-top.

§ 121.327 - Supplemental oxygen: Reciprocating engine powered airplanes.

§ 121.329 - Supplemental oxygen for sustenance: Turbine engine powered airplanes.

§ 121.331 - Supplemental oxygen requirements for pressurized cabin airplanes: Reciprocating engine powered airplanes.

§ 121.333 - Supplemental oxygen for emergency descent and for first aid; turbine engine powered airplanes with pressurized cabins.

§ 121.335 - Equipment standards.

§ 121.337 - Protective breathing equipment.

§ 121.339 - Emergency equipment for extended over-water operations.

§ 121.340 - Emergency flotation means.

§ 121.341 - Equipment for operations in icing conditions.

§ 121.342 - Pitot heat indication systems.

§ 121.343 - Flight data recorders.

§ 121.344 - Digital flight data recorders for transport category airplanes.

§ 121.344a - Digital flight data recorders for 10-19 seat airplanes.

§ 121.345 - Radio equipment.

§ 121.346 - Flight data recorders: filtered data.

§ 121.347 - Communication and navigation equipment for operations under VFR over routes navigated by pilotage.

§ 121.349 - Communication and navigation equipment for operations under VFR over routes not navigated by pilotage or for operations under IFR or over the top.

§ 121.351 - Communication and navigation equipment for extended over-water operations and for certain other operations.

§ 121.353 - Emergency equipment for operations over uninhabited terrain areas: Flag, supplemental, and certain domestic operations.

§ 121.354 - Terrain awareness and warning system.

§ 121.355 - Equipment for operations on which specialized means of navigation are used.

§ 121.356 - Collision avoidance system.

§ 121.357 - Airborne weather radar equipment requirements.

§ 121.358 - Low-altitude windshear system equipment requirements.

§ 121.359 - Cockpit voice recorders.

§ 121.360 - [Reserved]