Definition
The section of the Federal Aviation Regulations that contains the general operating and flight rules applicable to all civil aircraft operating within the United States. It covers areas such as pilot responsibilities, right-of-way rules, equipment requirements, fuel reserves, instrument flight rules, maintenance preflight requirements, and operating limitations for aircraft not engaged in commercial operations.
Plain English
FAR Part 91 is the main rulebook every pilot flies under in the U.S. It sets the basic rules for how to operate an aircraft safely and legally, from preflight checks and fuel requirements to how to fly in the clouds.
Context Anchor
Seen in FAA handbooks, flight training, checklists, and preflight planning when a rule or requirement is being tied to its legal source.
Derivation
FAR stands for Federal Aviation Regulations, the body of rules issued by the U.S. government to govern aviation. The regulations are divided into numbered Parts, each covering a specific area. Part 91 was assigned to general operating and flight rules — the baseline rules that apply to nearly every civil flight.
Why Pilots Care
Compliance ensures legal operation and prevents violations that could lead to enforcement action or compromised safety.
Analogy
Think of FAR Part 91 as part of the rules of the road for flying. It does not teach you how to fly the airplane, but it tells you what the law requires while you operate it.
Intuition Check
Do not read FAR Part 91 as just a handbook chapter or a suggestion. It is a legally enforceable set of federal rules; FAR here means Federal Aviation Regulations, not distance.
Example Sentence 1
Before departure, the pilot confirmed the flight met all Part 91 fuel reserve requirements for an IFR flight.
Example Sentence 2
FAR Part 91 states that the pilot in command bears final responsibility for the safety of the flight.