FLC OF AN EMBRAER BRASILIA E120; DECLARED AN EMER AND LANDED AT DEST (USING A STAR ARR) DUE TO PWR LOSS ON R ENG. MAINT WAS CONSULTED TO FIND OUT IF ANY FIX WAS POSSIBLE. FLT LANDED NORMALLY AND SAFELY.

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AFTER LEVELING OFF AT 9000 FT; THE R ENG TORQUE INDICATION DROPPED TO 20% (NORMAL AT CRUISE WAS 80%). THE ACFT STARTED TO ROLL TO THE R ABOUT 15 DEGS; HOWEVER; ALL OTHER ENG INSTS WERE NORMAL. I ELECTED NOT TO SHUT THE ENG DOWN BECAUSE WE STILL HAD GOOD GENERATORS AND HYD PRESSURE. THE ENG WAS NOT PRODUCING ANY PWR TO FLY. THE TORQUE GAUGE FLUCTUATED UP TO 125% BRIEFLY; AND THEN STABILIZED AT 20% AFTER ABOUT 30 SECONDS. WE CONTACTED MAINT CTL AND THEY ADVISED US TO MATCH THE PWR LEVER SETTINGS ON BOTH ENGS AND RESET OUR ELECTRONIC ENG CTL FUEL SCHEDULING UNIT. AGAIN THE R ENG TORQUE WAS STUCK AT 20%. WE DECLARED AN EMER WITH HOUSTON APCH CTL AND LANDED AT IAH SAFELY AND NORMALLY. THE PRELIMINARY GUESS FROM MAINT WAS THAT AN UNSCHEDULED FEATHER HAD OCCURRED FOR POSSIBLY A PROB IN THE PROP CTL UNIT. THIS INCIDENT OCCURRED 50 MI OUTSIDE OF HOUSTON ON THE GLAND SEVEN ARR AT 9000 FT. WE DEPARTED VICTORIA; TX; AT XA35 LCL TIME. THERE WERE 21 PEOPLE AND 3 CREW MEMBERS ABOARD. THE ACFT HAD JUST COME OUT OF A MAJOR 'C' CHK.