High Quality Content by WIKIPEDIA articles! Ulan-Ude Aviation Plant (UUAZ, Russian: - ) is a Russian joint-stock company specializing in aircraft manufacturing. It is based in Ulan-Ude, Buryatia. The company was founded in 1939 for repair services of I-16 fighters and SB bombers. During the World War II it produced La-5 and La-7 fighter airplanes. In 1956 the factory stepped into the epoch of helicopter production. A considerable part of the factory's history is devoted to manufacture of the most selling Mi-8 helicopter, started in 1970. The factory has produced over 4000 of Mi-8 helicopters altogether. As of 2009 its main products include Mi-8 , Mi-171, -171Sh helicopters, and Su-25UB and Su-39 attack aircraft. The company also produces household items.