Kas Thomas is one of the best-known experts on aircraft engine operation and maintenance. A multiengine and instrument-rated pilot with 40+ years of experience, Thomas has flown all major engine types and writes with authority about the care and upkeep of modern-day flat/opposed Lycoming and Continental engines. He has given FAA-accredited IA refresher courses and FAA Safety Seminars, and has appeared in videos sponsored by Shell Oil Company, Victor Engines, and ABC (Wide World of Flying). He spent 10 years as Associate Editor of The Aviation Consumer and founded Light Plane Maintenance in 1979.