How it works
Each lesson is a short read with worked examples, then practice questions in our own words, written like the knowledge test’s: most have you pick an answer, some ask you to work out a number (a CG, a rivet length, a torque setting) or name a part, and some have you tap steps into order. You can try again as often as you like; after two misses there’s a button to show the answer. To quiz each other, play Hangar Quiz, which draws its questions from all three courses, alone, on one phone or online.
What do I need to know first?
The General course first. The first lesson recaps the stresses and structure words the rest uses; the sheet metal sums need only a calculator.
The other aviation maintenance courses
- A&P mechanic: General: 11 lessons
- A&P mechanic: Powerplant: 10 lessons
Where is my progress saved? In this browser, like the rest of the site. Nothing to sign up for.
Which rules does it follow? The US ones, as of November 2026: 14 CFR parts 39, 43, 65 and 91, and the FAA’s Airman Certification Standards for aviation mechanics (FAA-S-ACS-1). Other countries license mechanics differently. Check the current rules and the FAA’s test guides before your tests.
An unofficial study course, not made by or affiliated with the FAA; the questions are our own, not from the tests, and finishing it doesn’t count toward a mechanic certificate. For real aircraft, always work from the manufacturer’s current manuals and approved data. Nothing here is a substitute for them or for supervised training.