Helicopter Sikorsky H-19B Chickasaw Serial 55-716 Register 52-7579 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 52-7579 US Air Force 1954-06-21Sikorsky S-55 c/n 55-716, ff:? del USAF as H-19B, 52-7579, 21Jun54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send