AN SMA PLT EXERCISED HIS EMER AUTHORITY AND DSNDED INTO CLR AIR WHEN ENCOUNTERING ICE.

Narrative

ON THE AFTERNOON OF JAN/FRI/93; I TOOK OFF WITH 5 PAX FROM LNN TO YTZ ON AN IFR FLT PLAN. I HAD GOTTEN A STANDARD BRIEFING (WX) FROM CLEVELAND FSS AT APPROX XA00 FOR AN XB00 DEP AND GOT THE USUAL FLT PRECAUTION FOR POSSIBLE ICING IN THE CLOUDS AND PRECIPITATION. I THEN LISTENED MORE INTENTLY FOR TEMP; PIREPS ON ICE AND TOPS; AND CURRENT CONDITIONS ALONG THE RTE. ALTHOUGH THE TEMP AT LNN WAS 35 DEGS F; THERE WERE ONLY 2 RPTS OF ICE ALONG THE RTE AND BOTH OF THOSE WERE FOR LIGHT RIME (AS RPTED BY LIGHT ACFT). I DECIDED TO GO BASED ON THIS INFO. ON CLBOUT THROUGH 4000 FT; ICE BEGAN TO ACCUMULATE RAPIDLY; AND I HAD TO ACT QUICKLY. KNOWING THAT LAKE ERIE; WITH NO OBSTRUCTIONS; WAS 2-3 MI N AND THE TEMPS WERE ABOVE FREEZING BELOW ME; I ELECTED TO DSND AND TURN N. I LOST CONTACT WITH CLE APCH AND CONTACTED LNN TWR WHO TOLD ME TO TRY ERI. I REACHED THE BASES AT 1800 FT MSL; DSNDED BELOW AND CANCELLED IFR. I PROCEEDED ALONG THE LAKE SHORE AND REQUESTED A FREQ CHANGE TO FSS AND GOT IT. WHILE TALKING WITH CLE FSS; I INADVERTENTLY ENTERED THE ERI ATA AND CTL ZONE WITHOUT CLRNC TO DO SO. SO AS TO AVOID THIS AGAIN; I WILL PAY MORE ATTN TO TEMPS AND GIVE THEM AS MUCH CREDENCE AS PIREPS AS TO ICING CONDITIONS.