Helicopter Sikorsky H-19B Chickasaw Serial 55-517 Register 52-7492 used by US Air Force USAF. Built 1953. Aircraft history and location Aircraft History 52-7492 US Air Force 1953-09-23Sikorsky S-55 c/n 55-517, ff:? del USAF as H-19B, 52-7492, 23Sep53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send