What was found
ON TAXI OUT, ATC NOTED FLAMES COMING FROM NR 1 ENGINE. SHUTDOWN NR 1 ENGINE & RETURNED TO GATE. AFTER FURTHER INSPECTION FOUND OIL ACCUMULATION IN CENTER PLUG CAVITY. ACCOMPLISHED A INSPECTION OF AFT SUMP OVERBOARD DRAIN LINES FLAME ARRESTOR MAGNETIC CHIP DETECTORS, NO DEFECT NOTED. NO DEFECT NOTED AT HONEYCOMB IAW IFIM 71-05 TASK 811. EXAMINED FLIGHT RECORD FOR CURRENT OIL CONSUMPTION, FOUND TO BE GOOD WITH A SPOT RATE OF .20. IDLE RUN ENGINE FOR 5 MINS, NO ABNORMAL OR FIRE INDICATION IAW AMM 71-00-00, TEST 3A.