What was found
ON CLIMB OUT, AN ELECTRICAL BURNING ODOR NOTICED IN COCKPIT FOLLOWED BY SMOKE COMING FROM AIR CON VENTS IN COCKPIT & CABIN, DONNED O2 MASKS & TURNED BACK, WHEN EXITING RUNWAY RECEIVED PACK 1 OVRHT IND. A/C OUT OF SERVICE. MX FOUND ACM FROZEN, R & R ACM IAW AMM, OPS CK GOOD, NO SMOKE NOTED. NR 1 PACK STILL HAS LOW FLOW PROBLEM, REPLACED NR 1 PACK FLOW CONTROL VALVE IAW AMM, ANTI-ICE VALVE, BYPASS VALVE, AND NR 1 & 2 PACK SENSORS, SYS OPS NORM. INSP OF ACM FOUND TURBINE OUTLET LINED WITH CARBON RESIDUE THAT HAD A NOTICEABLE ODOR, UNIT NOT SEIZED, BUT HAD A HIGH TORQUE OF 56 IN. LBS. DISASSY FOUND TURBINE BEARING DAMAGED WITH A SEVERE RUB & OVRHT COND THAT RESULTED IN A SCORED BEARING JOURNAL ON SHAFT ASSY.