Helicopter Sikorsky H-19D Chickasaw Serial 55-1273 Register 57-5972 used by US Army Aviation Army. Built 1959. Aircraft history and location Aircraft History 57-5972 US Army Aviation 1959-03-23Sikorsky S-55 c/n 55-1273, ff:? del US Army as H-19D, 57-5972, 23Mar59. Send Updates Use APP to upload photo @ (optional) When Now? / / Send