Helicopter Sikorsky H-19B Chickasaw Serial 55-673 Register 52-7554 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 52-7554 US Air Force 1954-03-26Sikorsky S-55 c/n 55-673, ff:? del USAF as H-19B, 52-7554, 26Mar54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send