Glossary of Aviation Terms | Part 121
Part 121 | Paramount Business Jets
Part 121 deals with the operating requirements of domestic, flag, and supplemental operations in commercial aviation. All scheduled air carriers operate under this part of the Federal Aviation Regulations, or FARs. In order for a pilot to fly for an airline, he must be certified under Part 121 or his company must be certified under Part 121. It is composed of twenty-three parts. The first is the SFARs (Special Federal Aviation Regulations) that outline rules and regulations for special situations, and the last section is the appendix. The other twenty-one sections are broken down and represented by the letters "A" – "X".
Air carriers operate under this part because it outlines the rules and regulations for aircraft carrying numerous people as well as weighing an immense amount. Certain Part 121 carriers can take off with aircraft weighing up to 900,000 pounds. The subparts are divided up and explained in the following graph:
| Subpart | Title | Description |
|---|---|---|
| A | General | basic compliance of rules, drugs, and alcohol |
| B,C,D | Reserved | reserved for future regulation sections |
| E | Approval of Routes: Domestic and Flag Operations | route approval for scheduled flight in and out of the United States |
| F | Approval of Areas and Routes for Supplemental Operations | routes for unscheduled flights |
| G | Manual Requirements | required manuals on board |
| H | Aircraft Requirements | limitations for the aircraft in flight |
| I | Airplane Performance and Operating Limitations | limitations for the aircraft in flight |
| J | Special Airworthiness Requirements | special certificates given to planes in special circumstances |
| K | Instrument and Equipment Requirements | required equipment and instruments on board the aircraft for flight |
| L | Maintenance, Preventive Maintenance, and Alterations | any maintenance performed on the aircraft |
| M | Airmen and Crewmember Requirements | requirements for crewmembers and airmen to be certified |
| N | Training Program | standards for airmen and crew training |
| O | Crewmember Qualifications | qualifications for the crew |
| P | Aircraft Dispatcher Qualifications and Duty Time | qualifications for dispatchers |
| Q | Flight Time Limitations and Rest Requirements: Domestic Operations | rest requirements and maximum flight time allowed inside the United States |
| R | Flight Time Limitations: Flag Operations | limitations on scheduled international flight |
| S | Flight Time Limitations: Supplemental Operations | limitations on unscheduled flights |
| T | Flight Operations | operations approved for flight |
| U | Dispatching and Flight Release Rules | handing out and releasing requirements for flight standards |
| V | Records and Reports requirements | for reports and records of flight time and aircraft usage |
| W | Crewmember Certificate: International | requirements for international crewmember certification |
| X | Emergency Medical Equipment and Training | training programs for medical equipment |
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