We Help You Pass Our free online study guide really works. You can study for your FAA private pilot ground school exam right now. For more info about the 4VFR.COM project, click here. You can find a daily update log here. Live ATC Audio Streams Tune into live air traffic control frequencies from North America. This feature requires Real player. Start listening to ATC now! Reference Library Our glossary lists and databases have grown quickly. I am working to create an on-line reference library to tie together all the loose ends. You can check out what is currently available in the library FAA Practice Exam - New! Introducing our newly enhanced practice exam. Now with figures!. Take a test a day for a week, and I guarantee you will do better on your exam. Get Started Now! Show your support for 4VFR.COM - Link us. Bookmark us. Tell your mother about us. Press CTRL-D to bookmark this site now!. Check out one of our proposed T-Shirt Designs. Feature Article: Trim History The trim tab or servo trim was invented by Anton Flettner, a German aeronautical engineer. He started work in 1905 for the Zeppelin Company. Died in 1962. Last Modified December 30, ©2025 TAGE.COM Related Links Featured Articles S-Turns Operating Without a MEL (Minimum Equipment List) Aeronautical Knowledge Run-up The Risks of Flying IFR Flying Faults Retractables Society of Automotive Engineers Phillips Head Screws Learning To Fly The Development of Aviation Power-off Stalls Start/Post Start Effective Instruction Private Pilot Endorsements More Flight Training Articles... Student Kudos "Great site, This is exactly what I was looking for. I am an aspiring future airline pilot and think this is an awesome resource for someone to sharpen their skills and prepare for exams. Great job. Justin." - Justin Barnes