FAR/AIM
>
Federal Aviation Regulations
>
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
Gleim provides the contents of its FAR/AIM digitally on our website for the benefit of those customers who need a concise, easy-to-use, quick reference of those regulations. For an on-the-go copy, the regulations are provided in a printed version, Gleim FAR/AIM.
Table of Contents
- Special Federal Aviation Regulation No. 50-2
- Special Federal Aviation Regulation No. 71
- Special Federal Aviation Regulation No. 97
-
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.
- § 121.9 – Fraud and falsification.
- § 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
- § 121.151 – Applicability.
- § 121.153 – Aircraft requirements: General.
- § 121.157 – Aircraft certification and equipment requirements.
- § 121.159 – Single-engine airplanes prohibited.
- § 121.161 – Airplane limitations: Type of route.
- § 121.162 – ETOPS Type Design Approval Basis.
- § 121.163 – Aircraft proving tests.
-
Subpart I—Airplane Performance Operating Limitations
- Editorial Note:
- § 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 – Compliance dates: 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 airplane simulators and other training devices.
- § 121.408 – Training equipment other than flight simulation training devices.
- § 121.409 – Training courses using airplane simulators and other training devices.
- § 121.410 – Airline transport pilot certification training program.
- § 121.411 – Qualifications: Check airmen (airplane) and check airmen (simulator).
- § 121.412 – Qualifications: Flight instructors (airplane) and flight instructors (simulator).
- § 121.413 – Initial, transition and recurrent training and checking requirements: Check airmen (airplane), check airmen (simulator).
- § 121.414 – Initial, transition and recurrent training and checking requirements: flight instructors (airplane), flight instructors (simulator).
- § 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, and upgrade ground training.
- § 121.421 – Flight attendants: Initial and transition ground training.
- § 121.422 – Aircraft dispatchers: Initial and transition ground training.
- § 121.423 – Pilot: Extended Envelope Training.
- § 121.424 – Pilots: Initial, transition, and upgrade flight training.
- § 121.425 – Flight engineers: Initial and transition flight training.
- § 121.427 – Recurrent 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.
- § 121.436 – 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.
-
Subpart DD—Special Federal Aviation Regulations
- § 121.1500 – SFAR No. 111—Lavatory Oxygen Systems.
- Appendix A to Part 121—First Aid Kits and Emergency Medical Kits
- Appendix B to Part 121—Airplane Flight Recorder Specification
- Appendix C to Part 121—C-46 Nontransport Category Airplanes
- Appendix D to Part 121—Criteria for Demonstration of Emergency Evacuation Procedures Under § 121.291
- Appendix E to Part 121—Flight Training Requirements
- Appendix F to Part 121—Proficiency Check Requirements
- Appendix G to Part 121—Doppler Radar and Inertial Navigation System (INS): Request for Evaluation; Equipment and Equipment Installation; Training Program; Equipment Accuracy and Reliability; Evaluation Program
- Appendix H to Part 121—Advanced Simulation
- Appendix K to Part 121—Performance Requirements for Certain Turbopropeller Powered Airplanes
- Appendix L to Part 121—Type Certification Regulations Made Previously Effective
- Appendix M to Part 121—Airplane Flight Recorder Specifications
- Appendix O to Part 121—Hazardous Materials Training Requirements For Certificate Holders
- Appendix P to Part 121—Requirements for ETOPS and Polar Operations