Helicopter Sikorsky H-19D Chickasaw Serial 55-984 Register 55-3228 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 55-3228 US Army Aviation 1956-08-01Sikorsky S-55 c/n 55-984, ff:? del US Army as H-19D, 55-3228, 01Aug56. Send Updates Use APP to upload photo @ (optional) When Now? / / Send