Definition
A three-tier classification system used by the FAA to group aircraft for the purposes of pilot certification and aircraft certification. Category is the broadest grouping (such as airplane, rotorcraft, glider, or lighter-than-air). Class is a subdivision within a category based on operating characteristics (such as single-engine land, multiengine land, single-engine sea, or multiengine sea for airplanes). Type refers to a specific make and basic model of aircraft (such as B-737 or CL-65), and a type rating is required to act as pilot in command of large aircraft over 12,500 lb maximum takeoff weight or any turbojet-powered airplane.
Plain English
A way the FAA sorts aircraft into three levels: category is the big group (like airplane), class is a smaller group within that (like single-engine land), and type is the exact make and model (like a Boeing 737). Pilot certificates and ratings are written using these terms.
Context Anchor
You will see this wording in FAA handbooks, pilot certificates, training records, aircraft checkout discussions, and questions about whether a pilot is allowed to act as pilot in command of a particular aircraft.
Derivation
All three words come from Latin: 'category' from Greek katēgoria meaning 'a class or division,' 'class' from Latin classis meaning 'a group or division,' and 'type' from Greek typos meaning 'a model or pattern.' The FAA borrowed these everyday sorting words and gave each one a precise, narrower meaning so that pilot privileges can be described exactly.
Why Pilots Care
A pilot may only fly aircraft in the categories, classes, and types listed on their certificate. Operating outside those limits requires additional training and a checkride.
Analogy
Think of it like sorting vehicles: vehicle is the broad idea, car or truck is a smaller group, and a specific model is the exact machine. In aviation, category, class, and type narrow the aircraft down in a similar way.
Intuition Check
Do not read these as casual everyday words. In FAA use, category, class, and type are formal levels of aircraft grouping that can affect what a pilot is trained and authorized to fly.
Example Sentence 1
Before flying the Citation, the pilot needed to add both a multiengine class rating and a CE-525 type rating to her certificate.
Example Sentence 2
Even though the new aircraft was in the same category and class, the pilot still needed a type checkout before flying it solo.