What was found
AC WAS NOT OPERATING UNDER PART 135, IT WAS UNDER PART 91 FLIGHT WHEN INCIDENT OCCURRED. PILOT STATEMENT "ENROUTE, AS WE CRESTED THE MOUNTAINS, THE ENGINE STARTED SPUTTERING, AND RPMS WERE DROPPING. APPLIED CARB HEAT, TRIED SWITCHING BETWEEN FUEL TANKS, MAGNETOS, AND THE RPMS KEPT DROPPING. WE THEN WENT THROUGH THE FORMAL CHECK LIST TO NO AVAIL. THE DECISION WAS MADE TO LAND AT RADAR FACILITY. BY THIS TIME THE ENGINE HAD STOPPED. WE MADE THE EMERGENCY LANDING AT THE FACILITY AND CAME TO A FULL STOP. DURING THE DESCENT, TRIED STARTING THE ENGINE MULTIPLE TIME, BUT IT DIDN’T START. NO ONE WAS INJURED AND THE PLANE WAS NOT DAMAGED.