Definition
An FAA aircraft certification category for simple, low-performance aircraft intended for pleasure and personal use. A primary category aircraft is unpowered, or powered by a single naturally aspirated engine with a maximum continuous power of no more than 200 horsepower; has a maximum certificated takeoff weight of no more than 2,700 pounds (or 3,375 pounds for a seaplane); seats no more than four occupants including the pilot; has an unpressurized cabin; and has fixed landing gear (or fixed or retractable for a seaplane). Owners of primary category aircraft holding at least a private pilot certificate may perform specified expanded preventive maintenance tasks on their own aircraft beyond what is allowed for standard category aircraft.
Plain English
A simple, light, single-engine airplane built for personal flying. Because these aircraft are basic in design, the FAA lets owner-pilots do more of their own routine maintenance on them than they could on a typical certified airplane.
Context Anchor
You see this term in preventive maintenance rules, aircraft certification records, and maintenance programs approved for that specific aircraft.
Derivation
‘Primary’ comes from the Latin primus, meaning ‘first’ or ‘most basic.’ The category name reflects the FAA’s intent: this is the most basic, entry-level certification tier for simple personal aircraft.
Why Pilots Care
Owners of these aircraft may legally perform a wider range of preventive maintenance tasks without requiring an A&P mechanic.
Intuition Check
Do not read primary as “main” or “most important.” Here, primary category aircraft means an aircraft placed by the FAA into a specific certification category with specific limits.
Example Sentence 1
Because her Cub was certificated as a primary category aircraft, she was able to perform additional preventive maintenance tasks the FAA does not allow on standard category aircraft.
Example Sentence 2
Primary category aircraft must still meet all airworthiness requirements before returning to flight.