Helicopter Sikorsky H-19C Chickasaw Serial 55-198 Register 51-14257 used by US Army Aviation Army. Built 1952. Aircraft history and location Aircraft History 51-14257 US Army Aviation 1952-08-12Sikorsky S-55 c/n 55-198, ff:? del as H-19C, 51-14257, 12Aug52. Send Updates Use APP to upload photo @ (optional) When Now? / / Send