Helicopter Sikorsky H-19D Chickasaw Serial 55-1232 Register 57-5978 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 57-5978 US Army Aviation 1958-09-29Sikorsky S-55 c/n 55-1232, ff:? del US Army as H-19D, 57-5978, 29Sep58. Send Updates Use APP to upload photo @ (optional) When Now? / / Send