Helicopter Sikorsky H-19B Chickasaw Serial 55-420 Register 51-3941 used by US Air Force USAF. Built 1953. Aircraft history and location Aircraft History 51-3941 US Air Force 1953-05-06Sikorsky S-55 c/n 55-420, ff:? del USAF as H-19B, 51-3941, 06May53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
