What was found
DURING CRUISE FLIGHT, ACFT EXPERIENCED A SUDDEN RIGHT YAW, A RAPID RISE IN TURBINE OUTLET TEMPERATURE (TOT), AND A TORQUE REDUCTION IN THE NR 1 ENGINE. REDUCING THE POWER LEVER TO IDLE ARRESTED THE RISE IN TOT AND AN UNEVENTFUL EMERGENCY LANDING WAS MADE. NO LIMITS WERE EXCEEDED. INSPECTION DETERMINED THE NR 1 ENGINE AIR INLET WAS 25 TO 50 PERCENT BLOCKED BY AN 11 INCH BY 3 INCH PIECE OF ANTI-CHAFE TAPE. THE MANUFACTURER INSTALLED TAPE HAD COME LOOSE FROM THE TRANSMISSION BY THE INLET DEFLECTOR SHIELD HOUSING AND WAS ALMOST INGESTED INTO THE COMPRESSOR. RECOMMEND CLOSELY CHECKING THE ANTI-CHAFE TAPE DURING THE DAILY, PRE-FLIGHT, AND 50-HOUR INSPECTIONS.