Helicopter Sikorsky H-19A Chickasaw Serial 55-168 Register 51-3889 used by US Air Force USAF. Built 1952. Aircraft history and location Aircraft History 51-3889 US Air Force 1952-06-17Sikorsky S-55 c/n 55-168, ff:? del USAF as H-19A, 51-3889, 17Jun52. 1953-07-10 10jul53 damaged in Korea Send Updates Use APP to upload photo @ (optional) When Now? / / Send