Home/CFR/Title 14/Part 121
FEDERAL · 14 CFR

Part 121 — Operating Requirements: Domestic, Flag, and Supplemental Operations

391 sections · Title 14: Aeronautics and Space

§ 121.1Applicability.
§ 121.2Compliance schedule for operators that transition to part 121; certain new entrant operators.
§ 121.4Applicability of rules to unauthorized operators.
§ 121.7Definitions.
§ 121.9§ 121.9 [Reserved]
§ 121.11Rules applicable to operations in a foreign country.
§ 121.15Carriage of narcotic drugs, marihuana, and depressant or stimulant drugs or substances.
§ 121.91Applicability.
§ 121.93Route requirements: General.
§ 121.95Route width.
§ 121.97Airports: Required data.
§ 121.99Communications facilities—domestic and flag operations.
§ 121.101Weather reporting facilities.
§ 121.103En route navigation facilities.
§ 121.105Servicing and maintenance facilities.
§ 121.106ETOPS Alternate Airport: Rescue and fire fighting service.
§ 121.107Dispatch centers.
§ 121.111Applicability.
§ 121.113Area and route requirements: General.
§ 121.115Route width.
§ 121.117Airports: Required data.
§ 121.119Weather reporting facilities.
§ 121.121En route navigation facilities.
§ 121.122Communications facilities—supplemental operations.
§ 121.123Servicing maintenance facilities.
§ 121.125Flight following system.
§ 121.127Flight following system; requirements.
§ 121.131Applicability.
§ 121.133Preparation.
§ 121.135Manual contents.
§ 121.137Distribution and availability.
§ 121.139Manual accessibility: Supplemental operations.
§ 121.141Airplane flight manual.
§ 121.151Applicability.
§ 121.153Aircraft requirements: General.
§ 121.155§ 121.155 [Reserved]
§ 121.157Aircraft certification and equipment requirements.
§ 121.159Single-engine airplanes prohibited.
§ 121.161Airplane limitations: Type of route.
§ 121.162ETOPS Type Design Approval Basis.
§ 121.163Aircraft proving tests.
§ 121.171Applicability.
§ 121.173General.
§ 121.175Airplanes: Reciprocating engine-powered: Weight limitations.
§ 121.177Airplanes: Reciprocating engine-powered: Takeoff limitations.
§ 121.179Airplanes: Reciprocating engine-powered: En route limitations: All engines operating.
§ 121.181Airplanes: Reciprocating engine-powered: En route limitations: One engine inoperative.
§ 121.183Part 25 airplanes with four or more engines: Reciprocating engine powered: En route limitations: Two engines inoperative.
§ 121.185Airplanes: Reciprocating engine-powered: Landing limitations: Destination airport.
§ 121.187Airplanes: Reciprocating engine-powered: Landing limitations: Alternate airport.
§ 121.189Airplanes: Turbine engine powered: Takeoff limitations.
§ 121.191Airplanes: Turbine engine powered: En route limitations: One engine inoperative.
§ 121.193Airplanes: Turbine engine powered: En route limitations: Two engines inoperative.
§ 121.195Airplanes: Turbine engine powered: Landing limitations: Destination airports.
§ 121.197Airplanes: Turbine engine powered: Landing limitations: Alternate airports.
§ 121.198Cargo service airplanes: Increased zero fuel and landing weights.
§ 121.199Nontransport category airplanes: Takeoff limitations.
§ 121.201Nontransport category airplanes: En route limitations: One engine inoperative.
§ 121.203Nontransport category airplanes: Landing limitations: Destination airport.
§ 121.205Nontransport category airplanes: Landing limitations: Alternate airport.
§ 121.207Provisionally certificated airplanes: Operating limitations.
§ 121.211Applicability.
§ 121.213§ 121.213 [Reserved]
§ 121.215Cabin interiors.
§ 121.217Internal doors.
§ 121.219Ventilation.
§ 121.221Fire precautions.
§ 121.223Proof of compliance with § 121.221.
§ 121.225Propeller deicing fluid.
§ 121.227Pressure cross-feed arrangements.
§ 121.229Location of fuel tanks.
§ 121.231Fuel system lines and fittings.
§ 121.233Fuel lines and fittings in designated fire zones.
§ 121.235Fuel valves.
§ 121.237Oil lines and fittings in designated fire zones.
§ 121.239Oil valves.
§ 121.241Oil system drains.
§ 121.243Engine breather lines.
§ 121.245Fire walls.
§ 121.247Fire-wall construction.
§ 121.249Cowling.
§ 121.251Engine accessory section diaphragm.
§ 121.253Powerplant fire protection.
§ 121.255Flammable fluids.
§ 121.257Shutoff means.
§ 121.259Lines and fittings.
§ 121.261Vent and drain lines.
§ 121.263Fire-extinguishing systems.
§ 121.265Fire-extinguishing agents.
§ 121.267Extinguishing agent container pressure relief.
§ 121.269Extinguishing agent container compartment temperature.
§ 121.271Fire-extinguishing system materials.
§ 121.273Fire-detector systems.
§ 121.275Fire detectors.
§ 121.277Protection of other airplane components against fire.
§ 121.279Control of engine rotation.
§ 121.281Fuel system independence.
§ 121.283Induction system ice prevention.
§ 121.285Carriage of cargo in passenger compartments.
§ 121.287Carriage of cargo in cargo compartments.
§ 121.289Landing gear: Aural warning device.
§ 121.291Demonstration of emergency evacuation procedures.
§ 121.293Special airworthiness requirements for nontransport category airplanes type certificated after December 31, 1964.
§ 121.295Location for a suspect device.
§ 121.301Applicability.
§ 121.303Airplane instruments and equipment.
§ 121.305Flight and navigational equipment.
§ 121.306Portable electronic devices.
§ 121.307Engine instruments.
§ 121.308Lavatory fire protection.
§ 121.309Emergency equipment.
§ 121.310Additional emergency equipment.
§ 121.311Seats, safety belts, and shoulder harnesses.
§ 121.312Materials for compartment interiors.
§ 121.313Miscellaneous equipment.
§ 121.314Cargo and baggage compartments.
§ 121.315Cockpit check procedure.
§ 121.316Fuel tanks.
§ 121.317Passenger information requirements, smoking prohibitions, and additional seat belt requirements.
§ 121.318Public address system.
§ 121.319Crewmember interphone system.
§ 121.321Operations in icing.
§ 121.323Instruments and equipment for operations at night.
§ 121.325Instruments and equipment for operations under IFR or over-the-top.
§ 121.326xxx
§ 121.327Supplemental oxygen: Reciprocating engine powered airplanes.
§ 121.329Supplemental oxygen for sustenance: Turbine engine powered airplanes.
§ 121.331Supplemental oxygen requirements for pressurized cabin airplanes: Reciprocating engine powered airplanes.
§ 121.333Supplemental oxygen for emergency descent and for first aid; turbine engine powered airplanes with pressurized cabins.
§ 121.335Equipment standards.
§ 121.337Protective breathing equipment.
§ 121.339Emergency equipment for extended over-water operations.
§ 121.340Emergency flotation means.
§ 121.341Equipment for operations in icing conditions.
§ 121.342Pitot heat indication systems.
§ 121.343Flight data recorders.
§ 121.344Digital flight data recorders for transport category airplanes.
§ 121.344aDigital flight data recorders for 10-19 seat airplanes.
§ 121.345Radio equipment.
§ 121.346Flight data recorders: filtered data.
§ 121.347Communication and navigation equipment for operations under VFR over routes navigated by pilotage.
§ 121.349Communication and navigation equipment for operations under VFR over routes not navigated by pilotage or for operations under IFR or over the top.
§ 121.351Communication and navigation equipment for extended over-water operations and for certain other operations.
§ 121.353Emergency equipment for operations over uninhabited terrain areas: Flag, supplemental, and certain domestic operations.
§ 121.354Terrain awareness and warning system.
§ 121.355Equipment for operations on which specialized means of navigation are used.
§ 121.356Collision avoidance system.
§ 121.357Airborne weather radar equipment requirements.
§ 121.358Low-altitude windshear system equipment requirements.
§ 121.359Cockpit voice recorders.
§ 121.360§ 121.360 [Reserved]
§ 121.361Applicability.
§ 121.363Responsibility for airworthiness.
§ 121.365Maintenance, preventive maintenance, and alteration organization.
§ 121.367Maintenance, preventive maintenance, and alterations programs.
§ 121.368Contract maintenance.
§ 121.369Manual requirements.
§ 121.370-121.370a§§ 121.370-121.370a [Reserved]
§ 121.371Required inspection personnel.
§ 121.373Continuing analysis and surveillance.
§ 121.374Continuous airworthiness maintenance program (CAMP) for two-engine ETOPS.
§ 121.375Maintenance and preventive maintenance training program.
§ 121.377Maintenance and preventive maintenance personnel duty time limitations.
§ 121.378Certificate requirements.
§ 121.379Authority to perform and approve maintenance, preventive maintenance, and alterations.
§ 121.380Maintenance recording requirements.
§ 121.380aTransfer of maintenance records.
§ 121.381Applicability.
§ 121.383Airman: Limitations on use of services.
§ 121.385Composition of flight crew.
§ 121.387Flight engineer.
§ 121.389Flight navigator and specialized navigation equipment.
§ 121.391Flight attendants.
§ 121.392Personnel identified as flight attendants.
§ 121.393Crewmember requirements at stops where passengers remain on board.
§ 121.394Flight attendant requirements during passenger boarding and deplaning.
§ 121.395Aircraft dispatcher: Domestic and flag operations.
§ 121.397Emergency and emergency evacuation duties.
§ 121.400Applicability and terms used.
§ 121.401Training program: General.
§ 121.402Training program: Special rules.
§ 121.403Training program: Curriculum.
§ 121.404Crew and dispatcher resource management training.
§ 121.405Training program and revision: Initial and final approval.
§ 121.406Credit for previous CRM/DRM training.
§ 121.407Training program: Approval of flight simulation training devices.
§ 121.408Training equipment other than flight simulation training devices.
§ 121.409Training courses using flight simulation training devices.
§ 121.410Airline transport pilot certification training program.
§ 121.411Qualifications: Check pilots and check flight engineers.
§ 121.412Qualifications: Flight instructors.
§ 121.413Initial, transition and recurrent training and checking requirements: Check pilots and check flight engineers.
§ 121.414Initial, transition and recurrent training and checking requirements: Flight instructors.
§ 121.415Crewmember and dispatcher training program requirements.
§ 121.417Crewmember emergency training.
§ 121.418Differences training and related aircraft differences training.
§ 121.419Pilots and flight engineers: Initial, transition, conversion and upgrade ground training.
§ 121.420Pilots: Upgrade ground training.
§ 121.421Flight attendants: Initial and transition ground training.
§ 121.422Aircraft dispatchers: Initial and transition ground training.
§ 121.423Pilots: Extended Envelope Training.
§ 121.424Pilots: Initial, transition, conversion, and upgrade flight training.
§ 121.425Flight engineers: Initial and transition flight training.
§ 121.426Pilots: Upgrade flight training.
§ 121.427Recurrent training.
§ 121.429Pilots in command: Leadership and command and mentoring training.
§ 121.431Applicability.
§ 121.432General.
§ 121.433Training required.
§ 121.434Operating experience, operating cycles, and consolidation of knowledge and skills.
§ 121.435Pilots: Operations Familiarization.
§ 121.436Pilot Qualification: Certificates and experience requirements.
§ 121.438Pilot operating limitations and pairing requirements.
§ 121.439Pilot qualification: Recent experience.
§ 121.440Line checks.
§ 121.441Proficiency checks.
§ 121.443Pilot in command qualification: Route and airports.
§ 121.445Pilot in command airport qualification: Special areas and airports.
§ 121.447§ 121.447 [Reserved]
§ 121.453Flight engineer qualifications.
§ 121.455-121.459§§ 121.455-121.459 [Reserved]
§ 121.461Applicability.
§ 121.463Aircraft dispatcher qualifications.
§ 121.465Aircraft dispatcher duty time limitations: Domestic and flag operations.
§ 121.467Flight attendant duty period limitations and rest requirements: Domestic, flag, and supplemental operations.
§ 121.470Applicability.
§ 121.471Flight time limitations and rest requirements: All flight crewmembers.
§ 121.473Fatigue risk management system.
§ 121.480Applicability.
§ 121.481Flight time limitations: One or two pilot crews.
§ 121.483Flight time limitations: Two pilots and one additional flight crewmember.
§ 121.485Flight time limitations: Three or more pilots and an additional flight crewmember.
§ 121.487Flight time limitations: Pilots not regularly assigned.
§ 121.489Flight time limitations: Other commercial flying.
§ 121.491Flight time limitations: Deadhead transportation.
§ 121.493Flight time limitations: Flight engineers and flight navigators.
§ 121.495Fatigue risk management system.
§ 121.500Applicability.
§ 121.503Flight time limitations: Pilots: airplanes.
§ 121.505Flight time limitations: Two pilot crews: airplanes.
§ 121.507Flight time limitations: Three pilot crews: airplanes.
§ 121.509Flight time limitations: Four pilot crews: airplanes.
§ 121.511Flight time limitations: Flight engineers: airplanes.
§ 121.513Flight time limitations: Overseas and international operations: airplanes.
§ 121.515Flight time limitations: All airmen: airplanes.
§ 121.517Flight time limitations: Other commercial flying: airplanes.
§ 121.519Flight time limitations: Deadhead transportation: airplanes.
§ 121.521Flight time limitations: Crew of two pilots and one additional airman as required.
§ 121.523Flight time limitations: Crew of three or more pilots and additional airmen as required.
§ 121.525Flight time limitations: Pilots serving in more than one kind of flight crew.
§ 121.527Fatigue risk management system.
§ 121.531Applicability.
§ 121.533Responsibility for operational control: Domestic operations.
§ 121.535Responsibility for operational control: Flag operations.
§ 121.537Responsibility for operational control: Supplemental operations.
§ 121.538Aircraft security.
§ 121.539Operations notices.
§ 121.541Operations schedules: Domestic and flag operations.
§ 121.542Flight crewmember duties.
§ 121.543Flight crewmembers at controls.
§ 121.544Pilot monitoring.
§ 121.545Manipulation of controls.
§ 121.547Admission to flight deck.
§ 121.548Aviation safety inspector's credentials: Admission to pilot's compartment.
§ 121.548aDOD Commercial Air Carrier Evaluator's Credential.
§ 121.549Flying equipment.
§ 121.550Secret Service Agents: Admission to flight deck.
§ 121.551Restriction or suspension of operation: Domestic and flag operations.
§ 121.553Restriction or suspension of operation: Supplemental operations.
§ 121.555Compliance with approved routes and limitations: Domestic and flag operations.
§ 121.557Emergencies: Domestic and flag operations.
§ 121.559Emergencies: Supplemental operations.
§ 121.561Reporting potentially hazardous meteorological conditions and irregularities of ground facilities or navigation aids.
§ 121.563Reporting mechanical irregularities.
§ 121.565Engine inoperative: Landing; reporting.
§ 121.567Instrument approach procedures and IFR landing minimums.
§ 121.569Equipment interchange: Domestic and flag operations.
§ 121.570Airplane evacuation capability.
§ 121.571Briefing passengers before takeoff.
§ 121.573Briefing passengers: Extended overwater operations.
§ 121.574Oxygen and portable oxygen concentrators for medical use by passengers.
§ 121.575Alcoholic beverages.
§ 121.576Retention of items of mass in passenger and crew compartments.
§ 121.577Stowage of food, beverage, and passenger service equipment during airplane movement on the surface, takeoff, and landing.
§ 121.578Cabin ozone concentration.
§ 121.579Minimum altitudes for use of autopilot.
§ 121.580Prohibition on interference with crewmembers.
§ 121.581Observer's seat: En route inspections.
§ 121.582Means to discreetly notify a flightcrew.
§ 121.583Carriage of persons without compliance with the passenger-carrying requirements of this part.
§ 121.584Requirement to view the area outside the flightdeck door.
§ 121.585Exit seating.
§ 121.586Authority to refuse transportation.
§ 121.587Closing and locking of flightcrew compartment door.
§ 121.589Carry-on baggage.
§ 121.590Use of certificated land airports in the United States.
§ 121.591Applicability.
§ 121.593Dispatching authority: Domestic operations.
§ 121.595Dispatching authority: Flag operations.
§ 121.597Flight release authority: Supplemental operations.
§ 121.599Familiarity with weather conditions.
§ 121.601Aircraft dispatcher information to pilot in command: Domestic and flag operations.
§ 121.603Facilities and services: Supplemental operations.
§ 121.605Airplane equipment.
§ 121.607Communication and navigation facilities: Domestic and flag operations.
§ 121.609Communication and navigation facilities: Supplemental operations.
§ 121.611Dispatch or flight release under VFR.
§ 121.613Dispatch or flight release under IFR or over the top.
§ 121.615Dispatch or flight release over water: Flag and supplemental operations.
§ 121.617Alternate airport for departure.
§ 121.619Alternate airport for destination: IFR or over-the-top: Domestic operations.
§ 121.621Alternate airport for destination: Flag operations.
§ 121.623Alternate airport for destination: IFR or over-the-top: Supplemental operations.
§ 121.624ETOPS Alternate Airports.
§ 121.625Alternate Airport weather minima.
§ 121.627Continuing flight in unsafe conditions.
§ 121.628Inoperable instruments and equipment.
§ 121.629Operation in icing conditions.
§ 121.631Original dispatch or flight release, redispatch or amendment of dispatch or flight release.
§ 121.633Considering time-limited systems in planning ETOPS alternates.
§ 121.635Dispatch to and from refueling or provisional airports: Domestic and flag operations.
§ 121.637Takeoffs from unlisted and alternate airports: Domestic and flag operations.
§ 121.639Fuel supply: All domestic operations.
§ 121.641Fuel supply: Nonturbine and turbo-propeller-powered airplanes: Flag operations.
§ 121.643Fuel supply: Nonturbine and turbo-propeller-powered airplanes: Supplemental operations.
§ 121.645Fuel supply: Turbine-engine powered airplanes, other than turbo propeller: Flag and supplemental operations.
§ 121.646En-route fuel supply: flag and supplemental operations.
§ 121.647Factors for computing fuel required.
§ 121.649Takeoff and landing weather minimums: VFR: Domestic operations.
§ 121.651Takeoff and landing weather minimums: IFR: All certificate holders.
§ 121.652Landing weather minimums: IFR: All certificate holders.
§ 121.653§ 121.653 [Reserved]
§ 121.655Applicability of reported weather minimums.
§ 121.657Flight altitude rules.
§ 121.659Initial approach altitude: Domestic and supplemental operations.
§ 121.661Initial approach altitude: Flag operations.
§ 121.663Responsibility for dispatch release: Domestic and flag operations.
§ 121.665Load manifest.
§ 121.667Flight plan: VFR and IFR: Supplemental operations.
§ 121.681Applicability.
§ 121.683Crewmember and dispatcher record.
§ 121.685Aircraft record: Domestic and flag operations.
§ 121.687Dispatch release: Flag and domestic operations.
§ 121.689Flight release form: Supplemental operations.
§ 121.691§ 121.691 [Reserved]
§ 121.693Load manifest: All certificate holders.
§ 121.695Disposition of load manifest, dispatch release, and flight plans: Domestic and flag operations.
§ 121.697Disposition of load manifest, flight release, and flight plans: Supplemental operations.
§ 121.698-121.699§§ 121.698-121.699 [Reserved]
§ 121.701Maintenance log: Aircraft.
§ 121.703Service difficulty reports.
§ 121.705Mechanical interruption summary report.
§ 121.707Alteration and repair reports.
§ 121.709Airworthiness release or aircraft log entry.
§ 121.711Communication records: Domestic and flag operations.
§ 121.713Retention of contracts and amendments: Commercial operators who conduct intrastate operations for compensation or hire.
§ 121.721Applicability.
§ 121.723Surrender of international crewmember certificate.
§ 121.801Applicability.
§ 121.803Emergency medical equipment.
§ 121.805Crewmember training for in-flight medical events.
§ 121.901Purpose and eligibility.
§ 121.903General requirements for Advanced Qualification Programs.
§ 121.905Confidential commercial information.
§ 121.907Definitions.
§ 121.909Approval of Advanced Qualification Program.
§ 121.911Indoctrination curriculum.
§ 121.913Qualification curriculum.
§ 121.915Continuing qualification curriculum.
§ 121.917Other requirements.
§ 121.919Certification.
§ 121.921Training devices and simulators.
§ 121.923Approval of training, qualification, or evaluation by a person who provides training by arrangement.
§ 121.925Recordkeeping requirements.
§ 121.1001Applicability and definitions.
§ 121.1003Hazardous materials training: General.
§ 121.1005Hazardous materials training required.
§ 121.1007Hazardous materials training records.
§ 121.1101Purpose and definition.
§ 121.1103§ 121.1103 [Reserved]
§ 121.1105Aging airplane inspections and records reviews.
§ 121.1107Repairs assessment for pressurized fuselages.
§ 121.1109Supplemental inspections.
§ 121.1111Electrical wiring interconnection systems (EWIS) maintenance program.
§ 121.1113Fuel tank system maintenance program.
§ 121.1115Limit of validity.
§ 121.1117Flammability reduction means.
§ 121.1119Fuel tank vent explosion protection.
§ 121.1200-121.1399§§ 121.1200-121.1399 [Reserved]
§ 121.1400-121.1499§§ 121.1400-121.1499 [Reserved]
§ 121.1500SFAR No. 111—Lavatory Oxygen Systems.