Narrative:

During an IFR flight from ski to SD8, I flew into icing conditions at 9000 MSL approximately 25 NM west of polo VOR. We requested and descended to 7000 MSL and then 5000 MSL. We had accumulated approximately 3/8 inches of rime ice on the leading edges of the aircraft at 8000 MSL and then the front windshield began to ice over until we (I had one passenger who is a pilot) could not see through the front windshield. When the shield began icing, we asked rockford approach for vectors for VOR-a at C73. We completed the approach and came out of the clouds at 1600 MSL. I saw the airport from the side window and had planned to land on runway 30. The winds were reported by rockford approach at 30-36 and 10 KTS. At the same time my passenger saw a water tower from the other side of the aircraft. The water tower is not idented on the approach plate so it was a surprise to us. I could not make my intended approach without losing sight of the water tower and or the airport so I decided to land on runway 12 by making a 30 degree left turn. Upon touching down. The braking was nil and we skidded approximately 1800 ft down the runway 12 off the end of the runway and through a barbed wire fence. No one answered on unicom so we were unable to get any actual airport information prior to landing other than what was provided by our approach plate. I believe the contributing factors to this incident were flight into icing conditions, unmarked obstacles near the airports and icing on the runways, and our selection of runways which was based on reduced visibility and our belief that continued flight in the ice could be total.

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Original NASA ASRS Text

Title: PLT DIVERTS TO LAND DUE TO ICING. SLIDES OFF END OF RWY DUE RWY ICING.

Narrative: DURING AN IFR FLT FROM SKI TO SD8, I FLEW INTO ICING CONDITIONS AT 9000 MSL APPROX 25 NM W OF POLO VOR. WE REQUESTED AND DSNDED TO 7000 MSL AND THEN 5000 MSL. WE HAD ACCUMULATED APPROX 3/8 INCHES OF RIME ICE ON THE LEADING EDGES OF THE ACFT AT 8000 MSL AND THEN THE FRONT WINDSHIELD BEGAN TO ICE OVER UNTIL WE (I HAD ONE PAX WHO IS A PLT) COULD NOT SEE THROUGH THE FRONT WINDSHIELD. WHEN THE SHIELD BEGAN ICING, WE ASKED ROCKFORD APCH FOR VECTORS FOR VOR-A AT C73. WE COMPLETED THE APCH AND CAME OUT OF THE CLOUDS AT 1600 MSL. I SAW THE ARPT FROM THE SIDE WINDOW AND HAD PLANNED TO LAND ON RWY 30. THE WINDS WERE RPTED BY ROCKFORD APCH AT 30-36 AND 10 KTS. AT THE SAME TIME MY PAX SAW A WATER TWR FROM THE OTHER SIDE OF THE ACFT. THE WATER TWR IS NOT IDENTED ON THE APCH PLATE SO IT WAS A SURPRISE TO US. I COULD NOT MAKE MY INTENDED APCH WITHOUT LOSING SIGHT OF THE WATER TWR AND OR THE ARPT SO I DECIDED TO LAND ON RWY 12 BY MAKING A 30 DEG L TURN. UPON TOUCHING DOWN. THE BRAKING WAS NIL AND WE SKIDDED APPROX 1800 FT DOWN THE RWY 12 OFF THE END OF THE RWY AND THROUGH A BARBED WIRE FENCE. NO ONE ANSWERED ON UNICOM SO WE WERE UNABLE TO GET ANY ACTUAL ARPT INFO PRIOR TO LNDG OTHER THAN WHAT WAS PROVIDED BY OUR APCH PLATE. I BELIEVE THE CONTRIBUTING FACTORS TO THIS INCIDENT WERE FLT INTO ICING CONDITIONS, UNMARKED OBSTACLES NEAR THE ARPTS AND ICING ON THE RWYS, AND OUR SELECTION OF RWYS WHICH WAS BASED ON REDUCED VISIBILITY AND OUR BELIEF THAT CONTINUED FLT IN THE ICE COULD BE TOTAL.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.