Helicopter Sikorsky H-19B Chickasaw Serial 55-619 Register 52-7528 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 52-7528 US Air Force 1954-01-15Sikorsky S-55 c/n 55-619, ff:? del USAF as H-19B, 52-7528, 15Jan54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send