The PAO Kazan Helicopter Plant (KVZ) has been manufacturing aircraft products since 1940s and making export supplies since 1956. In 2007, the Kazan Helicopters became part of the Russian Helicopters Holding. The company has been certified for the production and repairs of all modifications of Mi-8 / Mi-17. Reliability of Mi-17 helicopters is confirmed by more than 50 million flight hours. The Federal Air Transport Agency of the Russian Federation has issued a certificate to the training centre at Kazan Helicopters for training and retraining of ground and flight personnel.