What was found
AT 3000 FT, ON APPROACH, LT ENGINE BEGAN TO RUN ROUGH, PILOT PERFORMED FLOW CHECK, ALL ENGINE INSTRUMENTS APPEARED NORMAL, BOOST PUMPS TO LOW AS A PRECAUTIONARY. LT ENGINE CONTINUED TO RUN ROUGHER THEN SHUTDOWN, PILOT FEATHERED LT PROPELLER, LANDED WITHOUT INCIDENT. MAINT FOUND NR 5 CONNECTING ROD FAILED. (VIVIBLE THRU 8 INCHES IN DIAMETER HOLE IN CASE HALVES. REMOVED AND REPLACED LT ENGINE AND RELEASED AIRCRAFT BACK TO SERVICE. (NE01200505272)