What was found
AS ACFT DEPARTED JUST AFTER ROTATION RT ENGINE FAILED AND HAD NEGATIVE AUTOFEATHER. ACFT UNABLE TO CLIMB AND ADVISED TOWER OF ENGINE FAILURE. CONTINUED TO FLY ACFT, PRECEDED TO TROUBLESHOOT SITUATION. RT ENGINE WAS NOT FEATHERED WHICH WAS PREVENTING ACFT FROM CLIMBING. IMMEDIATELY FEATHERED RT ENGINE WHICH INSTANTLY ALLOWED US TO CLIMB OUT OF THE SITUATION. COMPLETED EMERGENCY FAILURE CHECKLIST AND CLIMBED TO 2500 FT. BRIEFED SINGLE ENGINE LANDING CHECKLIST. COMPLETED VISUAL APPROACH & LANDED SAFELY. TAXIED TO RAMP UNDER ONE ENGINE.