Helicopter Sikorsky YH-19 Serial 55-005 Register 49-2016 used by US Air Force USAF. Built 1950. Aircraft history and location Aircraft History 49-2016 US Air Force 1950-09-16Sikorsky S-55, c/n 55-005, ff:? del USAF as YH-19, 49-2016, 16Sep50, status unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send