What was found
ENGINE FIRE/AIR TURNBACK, ENCOUNTERED A SLIGHT YAW TO LEFT AND A MOMENTARY TORQUE DECREASE OF 5 PERCENT ON NR 1 ENGINE. AFTER PILOT SMELLED AN ODOR. GAUGES READ NORMAL EXCEPT ITT FOR NR 1 ENGINE HAD INCREASED TO 780 DEGREES. WITHIN 30 SECONDS, SMOKE DETECTED IN COCKPIT. CREW DONNED OXYGEN MASKS AND RECEIVED AN ENGINE FIRE INDICATION ON NR 1. AFTER NR 1 ENGINE SHUTDOWN AND NR 1 FIRE HANDLE PULLED, FIRE INDICATION CEASED AND SMOKE BEGAN TO SUBSIDE. DECLARED AND EMERGENCY AND IMMEDIATELY TURNED BACK TO DEPARTURE. LANDED WITHOUT INCIDENT. MANUFACTURER REPORTED A FRACTURE OF ONE LPT BLADE NEAR PLATFORM.