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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:

SubpartTitleDescription
AGeneralbasic compliance of rules, drugs, and alcohol
B,C,DReservedreserved for future regulation sections
EApproval of Routes: Domestic and Flag Operationsroute approval for scheduled flight in and out of the United States
FApproval of Areas and Routes for Supplemental Operationsroutes for unscheduled flights
GManual Requirementsrequired manuals on board
HAircraft Requirementslimitations for the aircraft in flight
IAirplane Performance and Operating Limitationslimitations for the aircraft in flight
JSpecial Airworthiness Requirementsspecial certificates given to planes in special circumstances
KInstrument and Equipment Requirementsrequired equipment and instruments on board the aircraft for flight
LMaintenance, Preventive Maintenance, and Alterationsany maintenance performed on the aircraft
MAirmen and Crewmember Requirementsrequirements for crewmembers and airmen to be certified
NTraining Programstandards for airmen and crew training
OCrewmember Qualificationsqualifications for the crew
PAircraft Dispatcher Qualifications and Duty Timequalifications for dispatchers
QFlight Time Limitations and Rest Requirements: Domestic Operationsrest requirements and maximum flight time allowed inside the United States
RFlight Time Limitations: Flag Operationslimitations on scheduled international flight
SFlight Time Limitations: Supplemental Operationslimitations on unscheduled flights
TFlight Operationsoperations approved for flight
UDispatching and Flight Release Ruleshanding out and releasing requirements for flight standards
VRecords and Reports requirementsfor reports and records of flight time and aircraft usage
WCrewmember Certificate: Internationalrequirements for international crewmember certification
XEmergency Medical Equipment and Trainingtraining programs for medical equipment

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