Helicopter Sikorsky H-19D Chickasaw Serial 55-1147 Register 56-4260 used by US Army Aviation Army. Built 1957. Aircraft history and location Aircraft History 56-4260 US Army Aviation 1957-11-21Sikorsky S-55 c/n 55-1147, ff:? del US Army as H-19D, 56-4260, 21Nov57. Send Updates Use APP to upload photo @ (optional) When Now? / / Send