What was found
AIRCRAFT WAS ENROUTE TO RESPOND TO A FIRE MISSION. WHILE ENROUTE THE SMOKE-JUMPER CREW SAW WHAT APPEARED TO BE SMOKE COMING FROM RIGHT AFT CABIN FLOORBOARDS. THE AIRCRAFT MADE AN UN-SCHEDULED LANDING AT GPI WITH NO INCIDENT. ONCE ON THE GROUND THE AIRCRAFT WAS INSPECTED AND FOUND TO HAVE A DISCONNECTED CABIN AIR SUPPLY DUCT AT APPROXIMATELY STA X530. THE SURROUNDING AREA WAS INSPECTED, AND NO OTHER DAMAGE OR DISCREPANCIES WERE NOTED AT THAT TIME.