Helicopter Sikorsky H-19D Chickasaw Serial 55-821 Register 54-1417 used by US Army Aviation Army. Built 1954. Aircraft history and location Aircraft History 54-1417 US Army Aviation 1954-12-06Sikorsky S-55 c/n 55-821, ff:? del US Army as H-19D, 54-1417, 06Dec54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send