What was found
ACFT DEPARTED AND ON DECENT THE RT ENGINE WAS ABRUPT AND VIBRATED. PILOT NOTICED AN INCREASE ON THE INTER-TURBINE TEMPERATURE AND A DECREASE IN ENGINE TORQUE. ENGINE WAS SHUTDOWN AS A PRECAUTIONARY ACTION AND RETURNED TO DEPARTURE AIRPORT WHICH WAS WITHIN 10 MINUTES OF FLIGHT. ACFT LANDED SAFELY. A BORESCOPE INSP WAS PERFORMED ON ENGINE AND ALL VISUAL INSP WERE GOOD. OIL SCREEN AND CHIP DETECTOR WERE INSPECTED AND NO METAL PARTICLES WERE FOUND. ENGINE OVERTEMP LIMITS PER SECOND ARE BEING EVALUATED TO DETERMINE MX PROCEDURES.