AN ACR B737-200 FLC HAS THE L ENG GENERATOR FAIL ON TKOF. THEY DECLARED AN EMER AND RETURNED AND LANDED. DURING THE POST FLT INSPECTION IT WAS FOUND THAT THE UNIT WAS WITHOUT OIL.

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ON TKOF ABOVE 100 KIAS; OBSERVED 1; 1 SECOND FLASH OF MASTER CAUTION AND 'ELEC' ANNUNCIATOR. SHORTLY AFTER GEAR UP L ENG GENERATOR FAILED. R ENG ACCEPTED APPROPRIATE TRANSFER BUS FUNCTIONS. APU INOP AND DEFERRED BY MAINT. L ENG GENERATOR INDICATED LOW OIL PRESSURE. UNSURE OF R ENG GENERATOR CONSTANT SPD DRIVE SERVICING STATUS. DUE TO IMC; ICE AND APPARENT DESIRE OF ORD ATC TO PUT US INTO NORMAL FLOW OF INBOUND TFC; ELECTED TO DECLARE EMER FOR PRIORITY HANDLING. AT 5000 FT MSL ELECTED TO ATTEMPT RESET OF L ENG GENERATOR -- SUCCESSFUL. CONTINUED APCH TO LNDG DUE TO UNCERTAIN FUTURE OF GENERATOR. ALL APPROPRIATE CHKLISTS COMPLETED. FLT ATTENDANTS ADVISED IN FLT; BUT NO CABIN PREPARATION REQUIRED OR DIRECTED. POST FLT REVEALED LOW/NO OIL IN L ENG CONSTANT SPD DRIVE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS B737-200 SAID THAT THE MAINT PERSONNEL CONCLUDED THAT THE CONSTANT SPD DRIVE HAD BEEN UNDER OR NOT SERVICED DURING ITS LAST CHK. THEY SERVICED THE UNIT; INSPECTED IT AND RETURNED IT TO THE LINE WITH NO REPAIRS NECESSARY. HE SAID THAT THE FLC'S DECISION TO RETURN IMMEDIATELY WAS A FACTOR IN NOT HAVING TO REPAIR THE CONSTANT SPD DRIVE ACCORDING TO THE MAINT PERSONNEL.