Helicopter Sikorsky H-19C Chickasaw Serial 55-175 Register 51-14242 used by US Army Aviation Army. Built 1952. Aircraft history and location Aircraft History 51-14242 US Army Aviation 1952-07-02Sikorsky S-55 c/n 55-175, ff:? del as H-19C, 51-14242, 02Jul52. Send Updates Use APP to upload photo @ (optional) When Now? / / Send