The light turbine-powered helicopter series incorporates the best of two worlds: legacy of proven flight design originated in the 269 Series and state-of-the art turbine technology. Dating back to 1956 with the first TH-55A U.S. Army , the 269 Series includes more than 3,750 aircraft operating in more than 70 countries with more than 20 million total flight hours. The turbine engine series was advanced with the S-333TM helicopter certified in 2000. Now the S-434TM helicopter will soon take to the sky. The light turbine series is a modern, fast, progressive helicopter line that will keep you flying for many decades to come.