Helicopter Sikorsky H-19B Chickasaw Serial 55-484 Register 51-3963 used by US Air Force USAF. Built 1953. Aircraft history and location Aircraft History 51-3963 US Air Force 1953-08-29Sikorsky S-55 c/n 55-484, ff:? del USAF as H-19B, 51-3963, 29Aug53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send