Helicopter Sikorsky H-19D Chickasaw Serial 55-851 Register 54-1425 used by US Army Aviation Army. Built 1955. Aircraft history and location Aircraft History 54-1425 US Army Aviation 1955-02-08Sikorsky S-55 c/n 55-851, ff:? del US Army as H-19D, 54-1425, 08Feb55. Send Updates Use APP to upload photo @ (optional) When Now? / / Send