What was found
POSSIBLE FUME EVENT DURING FLT. ENCOUNTER LIGHT TO MODERATE TURBULENCE FOLLOWED BY A STRONG SYNTHETIC ODOR. EMERGENCY DECLARED & O2 MASKS DAWNED. SEEMED TO ONLY BE SMELLED IN FLT DECK. OIL IN PACK SORT OF ODOR. (FLIGHT 5612), INSPECTED ACFT FOR EVIDENCE OF FLUID LEAKAGE. INSPECTED ENG OIL CAPS & APU OIL CAP FOR SECURITY & OIL SPILLAGE. NO DEFECTS NOTED. TROUBLESHOT POSSIBLE FUME EVENT IN COCKPIT IAW FIM 21-20-00. UPON INSP OF APU BAY, FOUND EVIDENCE OF LIGHT OIL SPILLAGE. CLEANED UP SPILLAGE & RAN APU TO INSPECT FOR LEAKS. NO LEAKS NOTED. PERFORMED RUN OF ENGS AT BOTH IDLE & 88% N2 FOR A MIN OF 10 MINS. DURING ENG RUNS, ISOLATED BLEEDS 1,& 2, APU BLEED, PACK 1, & 2. OPS PACKS AT BOTH HOT & COLD. FOUND NO EVIDENCE OF VISIBLE SMOKE COMING FROM COCKPIT OR CABIN VENTS REGARDLESS OF PACK/BLEED CONFIG. FOUND NO NOTICEABLE ODOR COMING FROM COCKPIT OR CABIN VENTS REGARDLESS OF PACK/BLEED CONFIG. NO 30 DAY HISTORY. ACFT OK FOR SERVICE.