Helicopter Sikorsky H-19B Chickasaw Serial 55-777 Register 53-4432 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4432 US Air Force 1954-10-06Sikorsky S-55 c/n 55-777, ff:? del USAF as H-19B, 53-4432, 06Oct54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send