Helicopter Sikorsky H-19A Chickasaw Serial 55-139 Register 51-3876 used by US Air Force USAF. Built 1952. Aircraft history and location Aircraft History 51-3876 US Air Force 1952-05-13Sikorsky S-55 c/n 55-139, ff:? del USAF as H-19A, 51-3876, 13May52. 1952-08-19 w/o 19aug52 TX Send Updates Use APP to upload photo @ (optional) When Now? / / Send