Helicopter Sikorsky H-19D Chickasaw Serial 55-1196 Register 57-1634 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 57-1634 US Army Aviation 1958-07-09Sikorsky S-55 c/n 55-1196, ff:? del US Army as H-19D, 57-1634, 09Jul58. Send Updates Use APP to upload photo @ (optional) When Now? / / Send