As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT THE PILOT NOTED SMOKE EMANATING FROM THE AFT CABIN AREA AND MADE AN EMERGENCY LANDING IN A FIELD LOCATION. AFTER TROUBLESHOOTING OF THE SYS, NOTED THE CIRCUIT BREAKER WAS IN THE OPEN POSITION AND THEREFORE DID NOT TRIP AS REQUIRED AFTER AFT EVAPORATOR BLOWER FAN BECAME INOPERATIVE THEREBY CAUSING AN OVERHEAT OF THE NOISE FILTERS WHICH IN TURN CAUSED THE SMOKE IN THE COCKPIT. NO RECOMMENDATIONS FOR RECURRENCE PREVENTION.