Part 121 — Operating Requirements: Domestic, Flag, and Supplemental Operations
Subpart A — General
- § 121.1— Applicability.
- § 121.2— Compliance schedule for operators that transition to part 121; certain new entrant operators.
- § 121.4— Applicability of rules to unauthorized operators.
- § 121.7— Definitions.
- § 121.11— Rules applicable to operations in a foreign country.
- § 121.15— Carriage of narcotic drugs, marihuana, and depressant or stimulant drugs or substances.
Subpart E — Approval of Routes: Domestic and Flag Operations
- § 121.91— Applicability.
- § 121.93— Route requirements: General.
- § 121.95— Route width.
- § 121.97— Airports: Required data.
- § 121.99— Communications facilities—domestic and flag operations.
- § 121.101— Weather reporting facilities.
- § 121.103— En route navigation facilities.
- § 121.105— Servicing and maintenance facilities.
- § 121.106— ETOPS Alternate Airport: Rescue and fire fighting service.
- § 121.107— Dispatch centers.
Subpart F — Approval of Areas and Routes for Supplemental Operations
- § 121.111— Applicability.
- § 121.113— Area and route requirements: General.
- § 121.115— Route width.
- § 121.117— Airports: Required data.
- § 121.119— Weather reporting facilities.
- § 121.121— En route navigation facilities.
- § 121.122— Communications facilities—supplemental operations.
- § 121.123— Servicing maintenance facilities.
- § 121.125— Flight following system.
- § 121.127— Flight following system; requirements.
Subpart G — Manual Requirements
Subpart H — Aircraft Requirements
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.
Subpart J — Special Airworthiness Requirements
- § 121.211— Applicability.
- § 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.
Subpart K — Instrument and Equipment Requirements
- § 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.
- § 121.317— Passenger information requirements, smoking prohibitions, and additional seat belt requirements.
- § 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.
Subpart L — Maintenance, Preventive Maintenance, and Alterations
- § 121.361— Applicability.
- § 121.363— Responsibility for airworthiness.
- § 121.365— Maintenance, preventive maintenance, and alteration organization.
- § 121.367— Maintenance, preventive maintenance, and alterations programs.
- § 121.368— Contract maintenance.
- § 121.369— Manual requirements.
- § 121.371— Required inspection personnel.
- § 121.373— Continuing analysis and surveillance.
- § 121.374— Continuous airworthiness maintenance program (CAMP) for two-engine ETOPS.
- § 121.375— Maintenance and preventive maintenance training program.
- § 121.377— Maintenance and preventive maintenance personnel duty time limitations.
- § 121.378— Certificate requirements.
- § 121.379— Authority to perform and approve maintenance, preventive maintenance, and alterations.
- § 121.380— Maintenance recording requirements.
- § 121.380a— Transfer of maintenance records.
Subpart M — Airman and Crewmember Requirements
- § 121.381— Applicability.
- § 121.383— Airman: Limitations on use of services.
- § 121.385— Composition of flight crew.
- § 121.387— Flight engineer.
- § 121.389— Flight navigator and specialized navigation equipment.
- § 121.391— Flight attendants.
- § 121.392— Personnel identified as flight attendants.
- § 121.393— Crewmember requirements at stops where passengers remain on board.
- § 121.394— Flight attendant requirements during passenger boarding and deplaning.
- § 121.395— Aircraft dispatcher: Domestic and flag operations.
- § 121.397— Emergency and emergency evacuation duties.
Subpart N — Training Program
- § 121.400— Applicability and terms used.
- § 121.401— Training program: General.
- § 121.402— Training program: Special rules.
- § 121.403— Training program: Curriculum.
- § 121.404— Crew and dispatcher resource management training.
- § 121.405— Training program and revision: Initial and final approval.
- § 121.406— Credit for previous CRM/DRM training.
- § 121.407— Training program: Approval of flight simulation training devices.
- § 121.408— Training equipment other than flight simulation training devices.
- § 121.409— Training courses using flight simulation training devices.
- § 121.410— Airline transport pilot certification training program.
- § 121.411— Qualifications: Check pilots and check flight engineers.
- § 121.412— Qualifications: Flight instructors.
- § 121.413— Initial, transition and recurrent training and checking requirements: Check pilots and check flight engineers.
- § 121.414— Initial, transition and recurrent training and checking requirements: Flight instructors.
- § 121.415— Crewmember and dispatcher training program requirements.
- § 121.417— Crewmember emergency training.
- § 121.418— Differences training and related aircraft differences training.
- § 121.419— Pilots and flight engineers: Initial, transition, conversion and upgrade ground training.
- § 121.420— Pilots: Upgrade ground training.
- § 121.421— Flight attendants: Initial and transition ground training.
- § 121.422— Aircraft dispatchers: Initial and transition ground training.
- § 121.423— Pilots: Extended Envelope Training.
- § 121.424— Pilots: Initial, transition, conversion, and upgrade flight training.
- § 121.425— Flight engineers: Initial and transition flight training.
- § 121.426— Pilots: Upgrade flight training.
- § 121.427— Recurrent training.
- § 121.429— Pilots in command: Leadership and command and mentoring training.
Subpart O — Crewmember Qualifications
- § 121.431— Applicability.
- § 121.432— General.
- § 121.433— Training required.
- § 121.434— Operating experience, operating cycles, and consolidation of knowledge and skills.
- § 121.435— Pilots: Operations Familiarization.
- § 121.436— Pilot Qualification: Certificates and experience requirements.
- § 121.438— Pilot operating limitations and pairing requirements.
- § 121.439— Pilot qualification: Recent experience.
- § 121.440— Line checks.
- § 121.441— Proficiency checks.
- § 121.443— Pilot in command qualification: Route and airports.
- § 121.445— Pilot in command airport qualification: Special areas and airports.
- § 121.453— Flight engineer qualifications.
Subpart P — Aircraft Dispatcher Qualifications and Duty Time
Subpart Q — Flight Time Limitations and Rest Requirements: Domestic Operations
Subpart R — Flight Time Limitations: Flag Operations
- § 121.480— Applicability.
- § 121.481— Flight time limitations: One or two pilot crews.
- § 121.483— Flight time limitations: Two pilots and one additional flight crewmember.
- § 121.485— Flight time limitations: Three or more pilots and an additional flight crewmember.
- § 121.487— Flight time limitations: Pilots not regularly assigned.
- § 121.489— Flight time limitations: Other commercial flying.
- § 121.491— Flight time limitations: Deadhead transportation.
- § 121.493— Flight time limitations: Flight engineers and flight navigators.
- § 121.495— Fatigue risk management system.
Subpart S — Flight Time Limitations: Supplemental Operations
- § 121.500— Applicability.
- § 121.503— Flight time limitations: Pilots: airplanes.
- § 121.505— Flight time limitations: Two pilot crews: airplanes.
- § 121.507— Flight time limitations: Three pilot crews: airplanes.
- § 121.509— Flight time limitations: Four pilot crews: airplanes.
- § 121.511— Flight time limitations: Flight engineers: airplanes.
- § 121.513— Flight time limitations: Overseas and international operations: airplanes.
- § 121.515— Flight time limitations: All airmen: airplanes.
- § 121.517— Flight time limitations: Other commercial flying: airplanes.
- § 121.519— Flight time limitations: Deadhead transportation: airplanes.
- § 121.521— Flight time limitations: Crew of two pilots and one additional airman as required.
- § 121.523— Flight time limitations: Crew of three or more pilots and additional airmen as required.
- § 121.525— Flight time limitations: Pilots serving in more than one kind of flight crew.
- § 121.527— Fatigue risk management system.
Subpart T — Flight Operations
- § 121.531— Applicability.
- § 121.533— Responsibility for operational control: Domestic operations.
- § 121.535— Responsibility for operational control: Flag operations.
- § 121.537— Responsibility for operational control: Supplemental operations.
- § 121.538— Aircraft security.
- § 121.539— Operations notices.
- § 121.541— Operations schedules: Domestic and flag operations.
- § 121.542— Flight crewmember duties.
- § 121.543— Flight crewmembers at controls.
- § 121.544— Pilot monitoring.
- § 121.545— Manipulation of controls.
- § 121.547— Admission to flight deck.
- § 121.548— Aviation safety inspector's credentials: Admission to pilot's compartment.
- § 121.548a— DOD Commercial Air Carrier Evaluator's Credential.
- § 121.549— Flying equipment.
- § 121.550— Secret Service Agents: Admission to flight deck.
- § 121.551— Restriction or suspension of operation: Domestic and flag operations.
- § 121.553— Restriction or suspension of operation: Supplemental operations.
- § 121.555— Compliance with approved routes and limitations: Domestic and flag operations.
- § 121.557— Emergencies: Domestic and flag operations.
- § 121.559— Emergencies: Supplemental operations.
- § 121.561— Reporting potentially hazardous meteorological conditions and irregularities of ground facilities or navigation aids.
- § 121.563— Reporting mechanical irregularities.
- § 121.565— Engine inoperative: Landing; reporting.
- § 121.567— Instrument approach procedures and IFR landing minimums.
- § 121.569— Equipment interchange: Domestic and flag operations.
- § 121.570— Airplane evacuation capability.
- § 121.571— Briefing passengers before takeoff.
- § 121.573— Briefing passengers: Extended overwater operations.
- § 121.574— Oxygen and portable oxygen concentrators for medical use by passengers.
- § 121.575— Alcoholic beverages.
- § 121.576— Retention of items of mass in passenger and crew compartments.
- § 121.577— Stowage of food, beverage, and passenger service equipment during airplane movement on the surface, takeoff, and landing.
- § 121.578— Cabin ozone concentration.
- § 121.579— Minimum altitudes for use of autopilot.
- § 121.580— Prohibition on interference with crewmembers.
- § 121.581— Observer's seat: En route inspections.
- § 121.582— Means to discreetly notify a flightcrew.
- § 121.583— Carriage of persons without compliance with the passenger-carrying requirements of this part.
- § 121.584— Requirement to view the area outside the flightdeck door.
- § 121.585— Exit seating.
- § 121.586— Authority to refuse transportation.
- § 121.587— Closing and locking of flightcrew compartment door.
- § 121.589— Carry-on baggage.
- § 121.590— Use of certificated land airports in the United States.
Subpart U — Dispatching and Flight Release Rules
- § 121.591— Applicability.
- § 121.593— Dispatching authority: Domestic operations.
- § 121.595— Dispatching authority: Flag operations.
- § 121.597— Flight release authority: Supplemental operations.
- § 121.599— Familiarity with weather conditions.
- § 121.601— Aircraft dispatcher information to pilot in command: Domestic and flag operations.
- § 121.603— Facilities and services: Supplemental operations.
- § 121.605— Airplane equipment.
- § 121.607— Communication and navigation facilities: Domestic and flag operations.
- § 121.609— Communication and navigation facilities: Supplemental operations.
- § 121.611— Dispatch or flight release under VFR.
- § 121.613— Dispatch or flight release under IFR or over the top.
- § 121.615— Dispatch or flight release over water: Flag and supplemental operations.
- § 121.617— Alternate airport for departure.
- § 121.619— Alternate airport for destination: IFR or over-the-top: Domestic operations.
- § 121.621— Alternate airport for destination: Flag operations.
- § 121.623— Alternate airport for destination: IFR or over-the-top: Supplemental operations.
- § 121.624— ETOPS Alternate Airports.
- § 121.625— Alternate Airport weather minima.
- § 121.627— Continuing flight in unsafe conditions.
- § 121.628— Inoperable instruments and equipment.
- § 121.629— Operation in icing conditions.
- § 121.631— Original dispatch or flight release, redispatch or amendment of dispatch or flight release.
- § 121.633— Considering time-limited systems in planning ETOPS alternates.
- § 121.635— Dispatch to and from refueling or provisional airports: Domestic and flag operations.
- § 121.637— Takeoffs from unlisted and alternate airports: Domestic and flag operations.
- § 121.639— Fuel supply: All domestic operations.
- § 121.641— Fuel supply: Nonturbine and turbo-propeller-powered airplanes: Flag operations.
- § 121.643— Fuel supply: Nonturbine and turbo-propeller-powered airplanes: Supplemental operations.
- § 121.645— Fuel supply: Turbine-engine powered airplanes, other than turbo propeller: Flag and supplemental operations.
- § 121.646— En-route fuel supply: flag and supplemental operations.
- § 121.647— Factors for computing fuel required.
- § 121.649— Takeoff and landing weather minimums: VFR: Domestic operations.
- § 121.651— Takeoff and landing weather minimums: IFR: All certificate holders.
- § 121.652— Landing weather minimums: IFR: All certificate holders.
- § 121.655— Applicability of reported weather minimums.
- § 121.657— Flight altitude rules.
- § 121.659— Initial approach altitude: Domestic and supplemental operations.
- § 121.661— Initial approach altitude: Flag operations.
- § 121.663— Responsibility for dispatch release: Domestic and flag operations.
- § 121.665— Load manifest.
- § 121.667— Flight plan: VFR and IFR: Supplemental operations.
Subpart V — Records and Reports
- § 121.681— Applicability.
- § 121.683— Crewmember and dispatcher record.
- § 121.685— Aircraft record: Domestic and flag operations.
- § 121.687— Dispatch release: Flag and domestic operations.
- § 121.689— Flight release form: Supplemental operations.
- § 121.693— Load manifest: All certificate holders.
- § 121.695— Disposition of load manifest, dispatch release, and flight plans: Domestic and flag operations.
- § 121.697— Disposition of load manifest, flight release, and flight plans: Supplemental operations.
- § 121.701— Maintenance log: Aircraft.
- § 121.703— Service difficulty reports.
- § 121.705— Mechanical interruption summary report.
- § 121.707— Alteration and repair reports.
- § 121.709— Airworthiness release or aircraft log entry.
- § 121.711— Communication records: Domestic and flag operations.
- § 121.713— Retention of contracts and amendments: Commercial operators who conduct intrastate operations for compensation or hire.
Subpart W — Crewmember Certificate: International
Subpart X — Emergency Medical Equipment and Training
Subpart Y — Advanced Qualification Program
- § 121.901— Purpose and eligibility.
- § 121.903— General requirements for Advanced Qualification Programs.
- § 121.905— Confidential commercial information.
- § 121.907— Definitions.
- § 121.909— Approval of Advanced Qualification Program.
- § 121.911— Indoctrination curriculum.
- § 121.913— Qualification curriculum.
- § 121.915— Continuing qualification curriculum.
- § 121.917— Other requirements.
- § 121.919— Certification.
- § 121.921— Training devices and simulators.
- § 121.923— Approval of training, qualification, or evaluation by a person who provides training by arrangement.
- § 121.925— Recordkeeping requirements.
Subpart Z — Hazardous Materials Training Program
Subpart AA — Continued Airworthiness and Safety Improvements
- § 121.1101— Purpose and definition.
- § 121.1105— Aging airplane inspections and records reviews.
- § 121.1107— Repairs assessment for pressurized fuselages.
- § 121.1109— Supplemental inspections.
- § 121.1111— Electrical wiring interconnection systems (EWIS) maintenance program.
- § 121.1113— Fuel tank system maintenance program.
- § 121.1115— Limit of validity.
- § 121.1117— Flammability reduction means.
- § 121.1119— Fuel tank vent explosion protection.