PA31 PLT HAD A PARTIAL LOSS OF PWR IN THE #2 ENG.

Narrative

DURING CLB IN IMC; A PARTIAL PWR LOSS OCCURRED IN THE R ENG. I REQUESTED A RETURN TO SBY AND RECEIVED CLRNC. I DID NOT DECLARE AN EMER. WX REQUIRED AN INST APCH. I ASKED FOR AND RECEIVED A CLRNC FOR THE RNAV RWY 5 APCH. I WAS CONCERNED THAT THE PWR LOSS WAS CAUSED BY EITHER AN OIL LEAK (TURBOCHARGER RELATED) OR AN EXHAUST LEAK WITH THE POSSIBILITY OF AN ENG FIRE. IN THE INTEREST OF EXPEDIENCY; I JUST INTERCEPTED THE FINAL APCH COURSE INSIDE THE IAP FIX AND PROCEEDED INBOUND. I DID NOT FLY THE APCH AS PUBLISHED. I DID NOT GET ESTABLISHED ON THE APCH BUT DSNDED ANYWAY. FORTUNATELY THE WX WAS GOOD ENOUGH THAT I WAS ABLE TO ATTAIN VFR AND PROCEED VFR TO LAND. I WAS FLYING SINGLE PLT. THE WORKLOAD GOT EXTREMELY HIGH. BECAUSE OF THE CLOSE PROX OF THE ARPT I HAD VERY LITTLE TIME TO PREPARE; FIND THE APCH PLATE; SETUP THE GPS; THE RESULT WAS THAT I BECAME SOMEWHAT DISORIENTED WITH REGARDS TO NAV. I USED POOR JUDGEMENT BY NOT DECLARING AN EMER AND BY NOT MAKING MORE USE OF THE AUTOPLT. I HAD TURNED IT OFF AT THE BEGINNING. A REVIEW OF PROGRAMMING PROCS OF THE GPS WOULD HAVE MADE IT EASIER. I HAD SOME DIFFICULTY SETTING UP THE GPS FOR APCH. I HAD TO ENTER IT TWICE TO GET IT RIGHT. I ALSO HAD TROUBLE INTERPING THE INFO IT PRESENTED. I AM VERY FAMILIAR WITH THIS GPS; BUT I NEED TO DEVELOP AND PRACTICE PROCS FOR QUICK ARPT/APCH SELECTION AND PAGE SELECTION FOR MOST HELPFUL NAV INFO. IE; QUICK PAGE SELECTION TO CHK POS RELATIVE TO THE ARPT. WHILE ON APCH AND WHEN NAVING WITH REF TO ANOTHER FIX; AND SELECTION OF INFO FIELDS THAT WILL GIVE THE MOST USEFUL INFO.