What was found
(CAN) PILOT REPORTED NR 1 ENGINE CHIP DETECTOR LIGHT CAME ON 6 MINUTES AFTER TAKEOFF. THE ENGINE WAS SHUTDOWN AND THE AIRCRAFT RETURNED TO BASE. REMOVAL OF CHIP DETECTOR REVEALED A LARGE PIECE OF METAL ACROSS THE LUGS. THE ENGINE WAS A LOANER AND WAS RETURNED TO THE OVERHAUL FACILITY FOR DISPOSITION. THE ENGINE HAS NOT BEEN SPLIT TO DETERMINE THE SOURCE OF THE METAL. PART TC: 718.