Helicopter Mil Mi-8T Hip-C Serial 133 04 Register HS-4 used by Maavoimat (Finnish Army). Aircraft history and location Aircraft History For HS-4 see also 1954 S-55 55-758 HS-4 Maavoimat 1974-09-04c/n 133 04 / 13304 Army d/d 04sep74 Pori school Send Updates Use APP to upload photo @ (optional) When Now? / / Send