Helicopter Sikorsky H-19D Chickasaw Serial 55-547 Register 52-7607 used by US Army Aviation Army. Built 1953. Aircraft history and location Aircraft History 52-7607 US Army Aviation 1953-10-12Sikorsky S-55 c/n 55-547, ff:? del US Army as H-19D, 52-7607, 12Oct53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send