What was found
DURING PRE-TAKEOFF FOR A SECOND FLIGHT OF THE DAY. THE PILOT NOTICED THE TAIL ROTOR CHIP LIGHT ILLUMINATED. PILOT COMPLETED SHUTDOWN OF AIRCRAFT WITHOUT INCIDENT. ON INITIAL INSPECTION OF CHIP DETECTOR THE NORMAL FUZZ WITH SLUDGE APPEARED. AFTER FURTHER INSPECTION WITH REMOVAL OF BEVEL GEAR PLUG, THE MECHANIC DETECTED NOTICEABLE WEAR ON THE PINION DRIVE GEAR THAT WAS CAUSE FOR REJECTION. CLEANED THE CHIP DETECTOR 4 HOURS BEFORE DURING EVENT 4 INSPECTION AND NO METAL FOUND AT THAT TIME. THIS IS THE 4TH CHIP LIGHT OCCURRENCE IN THE LAST 150 HOURS.