What was found
DURING TAKEOFF, ENGINE CHIP LIGHT ILLUMINATED SO AC RETURNED TO BASE. MAINTENANCE CLEANED AND INSPECTED BOTH PLUGS, FOUND 2 SMALL SLIVERS ON THE LOWER PLUG. INSPECTED BOTH FILTERS FOUND OK, DRAINED AND RESERVICED OIL TANK. COMPLIED WITH A 30 MINUTE GROUND RUN, NO OTHER DEFECTS NOTED. (K)