PVT PLT ENCOUNTERS ICING IN A NIGHT OP FLYING A C-172.

Narrative

I WAS FLYING A 172/U FROM NASHVILLE; TN; TO CHICAGO (CGX) ON IFR PLAN IN IMC. NEAR TERRE HAUTE I ENCOUNTERED MIXED RIME ICE; REQUESTED SEVERAL LOWER ALTS; ICING CONTINUED; THEN REQUESTED LNDG AT TERRE HAUTE. I REALIZED THAT ALTHOUGH I HAD APCH PLATES FOR MY DEP AREA (SE-1) AND DEST (EC-3) I DID NOT HAVE THE PLATES FOR TERRE HAUTE (EC-2). I INFORMED APCH AND THEY PROVIDED THE BASIC NUMBERS. BY THIS TIME I HAD DISCUSSED THE ICING NUMEROUS TIMES AND EXPECTED THE VECTORS THEY GAVE ME TO BE FOR A STRAIGHT-IN ILS APCH. WHAT I ACTUALLY WAS INSTRUCTED TO DO WAS A FULL PROC TURN. THIS REQUIRED SOME STEEP BANKING TO AVOID A FULL SCALE LOC DEFLECTION AND MISSED APCH; WHILE ALL THE TIME ICE WAS ACCUMULATING ON THE PLANE. (THE LNDG WAS SUCCESSFUL.) LESSONS: IFR PLTS SHOULD CARRY PLATES FOR ANY AND ALL AREAS NEAR THEIR FLT. APCH (ATC) SHOULD NEVER DIRECT ANY ACFT RPTING ICING TO PERFORM PROC TURNS OR ANY MANEUVER REQUIRING STEEP TURNS. ICE ON ACFT PRODUCES ELEVATED STALL SPDS; PARTICULARLY WHEN BANKING. ANY BUT THE MOST SHALLOW OF TURNS IS AN INVITATION TO DISASTER!