Helicopter Sikorsky H-19C Chickasaw Serial 55-321 Register 51-14312 used by US Army Aviation Army. Built 1953. Aircraft history and location Aircraft History 51-14312 US Army Aviation 1953-02-25Sikorsky S-55 c/n 55-321, ff:? del as H-19C, 51-14312, 25Feb53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send