What was found
ON APPROACH, EN ROUTE FROM SNA AN ELECTRICAL BURNING ODOR WAS NOTED IN THE COCKPIT, DECLARED EMERGENCY AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE TROUBLESHOT BURNING ODOR AND FOUND EXTRACT FAN SEIZED, REMOVED AND REPLACED EXTRACT FAN. CONFIRMED FAILURE OF EXTRACT FAN S/N 4091. UNIT SEIZED DUE TO CONTACT BETWEEN IMPELLER AND BELLMOUTH. FRONT FLANGE CENTER HOLE WAS WORN BEYOND TOLERANCE AND BEARING WERE BROKEN. REPLACED FRONT FLANGE & BEARINGS; BLENDED IMPELLER & BELLMOUTH, BALANCED ROTOR & MOTOR/IMPELLER, AND FUNCTIONALLY TESTED UNIT IAW CMM 21-26-42, REV. 6.