What was found
RT ENGINE HAD "ENGINE CHIP DETECT-R" CAS MESSAGE IMMEDIATELY AFTER TAKEOFF. NO ENGINE VIBRATIONS. NO SECONDARY ENGINE INSTRUMENT INDICATIONS. LIGHT STAYED ON FOR 20-30 SECONDS THEN WENT OUT FOR 5-10 SECONDS AND KEPT REPEATING UNTIL LANDING. REMOVED RT CHIP DETECTOR AND FOUND A SINGLE HAIR-LIKE FILAMENT ACROSS DETECTOR POLES. REMOVED RT OIL FILTER AND INSPECTED. NO NOTICEABLE DEBRIS ON FILTER. INSTALLED NEW FILTER AND CLEANED CHIP DETECTOR. OPERATED RT ENGINE FOR 10 MINUTES. NO CAS MESSAGES AND CHIP DETECTOR WAS CLEAN. ALL WORK DONE IAW MM 72-00-00.