The availability of Bulgarian Air Force (Voennovozdushni Sili, VVS) Mi-24 'Hind' attack helicopters was doubled from one to two aircraft on 21 December when a newly overhauled, 1986-produced Mi-24V 'Hind-E' (No 143) rejoined the VVS's 24th Helicopter Air Base at Krumovo following heavy maintenance at the Sofia-based TEREM-LETETS repair plant.
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