Helicopter Sikorsky H-19D Chickasaw Serial 55-870 Register 54-1435 used by US Army Aviation Army. Built 1955. Aircraft history and location Aircraft History 54-1435 US Army Aviation 1955-03-29Sikorsky S-55 c/n 55-870, ff:? del US Army as H-19D, 54-1435, 29Mar55. Send Updates Use APP to upload photo @ (optional) When Now? / / Send