PA31; SUFFERING PWR LOSS IN 1 ENG; MAKES UNAUTH PAR APCH WHEN WX BELOW MINIMUMS FOR NON PRECISION APCHS.

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DEPARTED RWY 19R FAI ON IFR FLT PLAN FAI-SCC APPROX XA00 LCL. EXPERIENCED A PARTIAL PWR LOSS ON R ENG CLBING THROUGH 6000 FT MSL (MEA FOR RTE OF FLT 10000 FT). REQUESTED APCH CLRNC BACK TO FAI. NEW FAI WX DETERIORATED TO 100 FT CEILING AND 1/2 SM IN FOG. EXECUTED LOC APCH INTO FAI TO MISSED APCH. FIELD NOT IN SIGHT. EXECUTED MISSED APCH. HELD FOR APPROX 30 MINS IN AREA WITH CONTINUOUS ICING COLLECTING ON AIRFRAME. REQUESTED WX FOR OTHER ARPTS; ALL ARPTS IN VICINITY DETERIORATING. REQUESTED ASR APCH INTO FBK; 300 FT; 1 SM. EXECUTED ASR APCH TO MISSED APCH. FIELD NOT IN SIGHT. EXECUTED MISSED APCH. CONCLUDED SAFE LNDG IN THE AREA WAS IMPROBABLE. WHILE EXECUTING NON PRECISION APCHS; REQUESTED PAR APCH INTO FBK AS FAI ILS'S WERE OTS. EXECUTED PAR APCH INTO FBK WITH SAFE LNDG. 2 DEVS FROM FAR RESULTED: 1) ALS OTS IN FAI; THEREFORE; PRIOR TO PASSING FAF ON FAI LOC RWY 19R APCH; WX NEEDED WAS 1 MI VISIBILITY; NOT 1/2 MI AS RPTED (MINIMUMS FOR APCH 1/2 MI AND 1/2 MI FOR INOP COMPONENTS.) 2) SUCCESSFUL PAR INTO FBK WAS A DEV DUE TO REQUIREMENTS OF 135.297. ALL PRECISION APCHS TO BE USED MUST BE DEMONSTRATED EVERY 6 MONTHS ON COMPANY IFR CHK RIDE. NO LONGER A COMPANY POLICY TO TRAIN AND CHK FOR PAR APCHS. CORRECTIVE ACTION: I DON'T BELIEVE I WOULD DO ANYTHING DIFFERENT UNDER SAME SCENARIO. HAVING EXPERIENCED A PARTIAL PWR LOSS OF THE R ENG; I DID NOT WANT TO LEAVE THE AREA WHERE EMER SVCS AND PRECISION APCHS WERE AVAILABLE. I BELIEVE THESE DEVS OCCURRED IN THE BEST INTEREST OF SAFETY.