Definition
Pilots and aircraft operators conducting flights under Title 14 Code of Federal Regulations (14 CFR) Part 91, the set of general operating and flight rules that applies to most non-commercial flying in the United States, including private flights, personal travel, and many corporate operations not flown for compensation or hire.
Plain English
These are pilots flying under the basic FAA rulebook for general aviation — the rules that cover private and personal flying, rather than the stricter rules used for airlines or charter operations.
Context Anchor
Seen in FAA procedure discussions when a rule, limitation, or allowance applies differently depending on what kind of operation is being flown.
Derivation
Part 91' refers to the numbered section (Part 91) of Title 14 of the Code of Federal Regulations. The CFR organizes federal rules into numbered Titles and Parts, and Part 91 happens to be the part containing general flight rules. The number itself has no meaning beyond its place in the regulation.
Why Pilots Care
Determines the exact visibility, ceiling, and equipment requirements a helicopter pilot must meet for instrument approaches and alternate airport planning.
Intuition Check
Do not read “Part 91 Operators” as a type of helicopter or a skill level. It means the flight is being conducted under a specific FAA rule set: Part 91.
Example Sentence 1
Part 91 operators may fly an instrument approach to lower minimums than some charter operators because Part 135 imposes additional restrictions.
Example Sentence 2
When planning an instrument flight under Part 91, the pilot checked the forecast weather against the alternate airport requirements listed for general aviation operators.