Helicopter Mil Mi-4 Hound Serial 04 159 Register 52 used by bulgarski voennovazdushni sili (bulgarian air force). Aircraft history and location Aircraft History 52 bulgarski voennovazdushni sili Mi-4ME. 2016-09 A LBPD Exhibit at Museum of Aviation, Krumovo. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
