Helicopter Sikorsky H-19D Chickasaw Serial 55-951 Register OH-HSA 55-3207 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 55-3207 US Army Aviation 1956-04-05Sikorsky S-55 c/n 55-951, ff:? del US Army as H-19D, 55-3207, 05Apr56. OH-HSA - To Finland as OH-HSA, wfu Send Updates Use APP to upload photo @ (optional) When Now? / / Send