Aircraft mechanics inspect, repair and sign off airplanes and helicopters, from a flight school's trainers to airliners overnight in a hangar. In the United States they hold an FAA mechanic certificate with the Airframe and Powerplant ratings, usually called an A&P.
The FAA tests mechanics in three sections, and this path follows them: General (the shared basics), then Airframe (structure and systems) and Powerplant (engines and propellers), which can be taken in either order. Each course is short lessons with practice that checks your answers, and Hangar Quiz turns all three into a quiz you can play with classmates.
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General
What every mechanic needs: the certificate and the rules, maths and physics, weight and balance, hardware, corrosion, electricity and inspections.
Structures and their repair in metal, wood, fabric and composites, then the systems: controls, landing gear, hydraulics, cabin air, ice and fire protection, instruments and fuel.
Excel: Formulas (10 lessons). Shops track inspections, parts and weight and balance sums in spreadsheets.
More info
How the path works
Take the courses in order, or start wherever you like: each one opens with a short recap of what it uses from the earlier ones. Your progress is each course’s own, saved in this browser, so lessons you’ve already done count here too. Each course has its own final exam and certificate once you’ve done every lesson.
Is it a qualification?
No. To work as an A&P you need the FAA's knowledge, oral and practical tests, and before them 18 to 30 months of real experience or an FAA-approved maintenance school, where you'll do the hands-on work these courses can only describe. This path helps you learn and review the knowledge; it isn't training on real aircraft or a qualification.