Helicopter Sikorsky H-19D Chickasaw Serial 55-1017 Register 56-1526 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 56-1526 US Army Aviation 1956-09-24Sikorsky S-55 c/n 55-1017, ff:? del US Army as H-19D, 56-1526, 24Sep56. Send Updates Use APP to upload photo @ (optional) When Now? / / Send