Helicopter Bell UH-1F Iroquois Serial 7109 Register N491DF 66-1213 used by CAL FIRE ,US Air Force USAF. Aircraft history and location Aircraft History 66-1213 US Air Force wfu 1973. to US Gov as N491DF For N491DF see also uh-1h 12146 N491DF State of California CAL FIRE Feb82-May96 CAL FIRE Send Updates Use APP to upload photo @ (optional) When Now? / / Send