Pilot's Handbook of Aeronautical Knowledge
The core knowledge handbook for every certificate — aerodynamics, weather, airspace, navigation, systems, performance, and aeromedical factors in one book.
About this document
The Pilot's Handbook of Aeronautical Knowledge (PHAK) is the FAA's foundational reference for aeronautical knowledge and the single most-cited source on the private and sport pilot knowledge tests. If you learn one book cover to cover, this is the one.
It covers the principles of flight and aerodynamics, aircraft structures and systems, flight instruments, weight and balance, aircraft performance, weather theory and weather services, airport operations, airspace, navigation, aeromedical factors, aeronautical decision-making, and more. Because it introduces almost every topic a student pilot must understand, it underpins the Private Pilot, Sport Pilot, and Recreational Pilot knowledge tests and remains a go-to reference through the Commercial and Instructor levels.
Use it to build the why behind a rule or procedure — then confirm the exact regulatory numbers in 14 CFR, because handbooks explain concepts while the regulations state the binding limits.
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Take a free practice test →FAA-H-8083-25 is an official FAA publication in the public domain. We host a copy so you can read it in-browser; always confirm you are reading the current edition on faa.gov. The description above is an original summary and is a study aid, not a substitute for the document or the regulations.