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Part 121
§ 121.159

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14 CFR · Part 121

14 CFR § 121.159

Single-engine airplanes prohibited.

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Read in Subpart H

Part 121 Contents

Subpart A: General
Subpart E: Approval of Routes: Domestic and Flag Operations
Subpart F: Approval of Areas and Routes for Supplemental Operations
Subpart G: Manual Requirements
Subpart H: Aircraft Requirements
Subpart I: Airplane Performance Operating Limitations
Subpart J: Special Airworthiness Requirements
Subpart K: Instrument and Equipment Requirements
Subpart L: Maintenance, Preventive Maintenance, and Alterations
Subpart M: Airman and Crewmember Requirements
Subpart N: Training Program
Subpart O: Crewmember 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
Subpart S: Flight Time Limitations: Supplemental Operations
Subpart T: Flight Operations
Subpart U: Dispatching and Flight Release Rules
Subpart V: Records and Reports
Subpart W: Crewmember Certificate: International
Subpart X: Emergency Medical Equipment and Training
Subpart Y: Advanced Qualification Program
Subpart Z: Hazardous Materials Training Program
Subpart AA: Continued Airworthiness and Safety Improvements
Subpart DD: Special Federal Aviation Regulations
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

No certificate holder may operate a single-engine airplane under this part.

Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.

Primary Source

Official Source (14 CFR · Part 121)