The greatest producer of Bücker outside Germany was Japan. It was also used in Finland, Hungary, Spain, Sweden, Switzerland and in Czechoslovakia after war. There were produced 300 machines named Aero C-4 until 1949 in Czechoslovakia. Our plane was built by Polish company Serwis Samolotów Historycznych J & J Karasiewicz in 2005. It was their 25th piece. Airplane T131.Pa Jungmann was built on the basis of original documentation from Tatra. Tatra produced Bückers before World War II. Our Bücker has Czech engine LOM M-332. It’s registered in Experimental category and it’s certified for aerobatics.