What was found
PILOT REPORTED THAT THE RT PROP FEATHERED ON FINAL, BEFORE PROPS PUSHED FWD, PROPS AT 1550 TORQUE, DID NOT SECURE ENGINE, PULLED POWER BACK TO IDLE, AS 180KTS, FLAPS 17, DECLARED AN EMERGENCY, SECURED ENGINE ONCE ON GROUND. MAINTENANCE FOUND PROPELLER STIFF AND DAMAGED. PRIMARY GOVERNOR REMOVE,D OIL FILTER & CHIP PLUG FOUND CAT 23. METAL TC 1900-3009, STEPS 1-12. R & R RT ENGINE.