PLT OF A C182 COULD NOT HOLD ASSIGNED ALT JUST PRIOR TO AN ILS APCH DUE TO ICING CONDITIONS RESULTING IN DECLARING AN EMER WITH CTR WHO WAS THE APCH CTL FACILITY FOR THE UNCTLED AOO ARPT.

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AREA FORECAST WAS FOR LIGHT TO MODERATE MIXED ICING IN CLOUDS FROM 3000 FT TO 8000 FT. I HAD BEEN OUT EARLIER AND TOPS WERE AT 5000 FT TO 6000 FT AND NO ICE ACCUMULATION. I HAD JUST COME TO 9G1 FROM IAG AND HEARD NO RPTS OF ICING ON THE CTR OR APCH FREQS (CTLRS WERE ASKING). I FILED A FLT PLAN TO AOO FROM 9G1. THE FSS ASKED ME IF I WANTED A FULL RTE BRIEFING AND I DECLINED. HE SAID 'WE HAVE THE NORMAL ICING PIREP AND I REPLIED THAT I HAD JUST COME IN. I DECLINED ANY FURTHER BRIEFING. I WAS FLYING AT 5000 FT ON A 25 MIN FLT CLR OF CLOUDS. BASES APPEARED TO BE AT 7000-8000 FT; TEMP WAS -1 DEG C; BASES LOWERED TO 5000 FT THEN LOWER. A COMMUTER WAS ON THE ILS TO RWY 20 AT AOO. I CALLED THE COMMUTER AND WAS TOLD BASES WERE 3000 FT. I WAS 4 MI S OF REC VOR/DME WHEN I FELT THE ACFT SLOWING AND DSNDING. WITHIN 1 MIN I HAD ACCUMULATED APPROX 1-2 INCHES OF ICE. I WAS AT FULL PWR AND DSNDED TO BELOW 3000 FT MSL. MVA IS 4600 FT MSL. EMER WAS DECLARED. BROKE OUT OF CLOUDS AT 500 FT AGL. TEMP WAS 0-1 DEG C. I STARTED TO SHED ICE. COMPLETED ILS TO RWY 20; LANDED WITH 90% PWR; 0 DEG FLAPS; XING THRESHOLD AT 110 KTS TO MAINTAIN FLYING CTL OF THE ACFT (NORMAL TOUCHDOWN SPD 70 KTS). LESSONS LEARNED: 1) GET FULL FLT BRIEFINGS. THERE WAS A PIREP FOR SEVERE CLR ICING RPTED IN PGH AROUND THE TIME I WAS FLYING. 2) GET ON TOP AND STAY ON TOP WHEN POSSIBLE ICING EXISTS. 3) DON'T GO UNLESS ABOVE FREEZING AT MEA/MVA.