Helicopter Sikorsky H-19A Chickasaw Serial 55-085 Register 51-3852 used by US Air Force USAF. Built 1952. Aircraft history and location Aircraft History 51-3852 US Air Force 1952-01-04Sikorsky S-55 c/n 55-085, ff:? del USAF as H-19A, 51-3852, 04Jan52. Send Updates Use APP to upload photo @ (optional) When Now? / / Send