Helicopter Sikorsky H-19D Chickasaw Serial 55-1212 Register 57-5931 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 57-5931 US Army Aviation 1958-06-03Sikorsky S-55 c/n 55-1212, ff:? del US Army as H-19D, 57-5931, 03Jun58. Send Updates Use APP to upload photo @ (optional) When Now? / / Send