Helicopter Sikorsky H-19B Chickasaw Serial 55-494 Register 52-7483 used by US Air Force USAF. Built 1953. Aircraft history and location Aircraft History 52-7483 US Air Force 1953-09-10Sikorsky S-55 c/n 55-494, ff:? del USAF as H-19B, 52-7483, 10Sep53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send