Narrative:

On the particular day in question, I had scheduled a flight from dpa to mwc and immediately back to dpa. In my usual anticipation of a flight. I consulted duats as well as a flight briefer, for WX. The ceiling was measured 2400 ft overcast, and 40 degrees fahrenheit. The cloud layer was reported to be 2000 ft thick with warm, clear air, above. The WX below the clouds was bumpy, with only 10 mi visibility. For my passenger sake, as well as the added safety of an IFR flight, I elected to fly above the clouds. The flight up, went without a hitch, without any sign of ice. After landing at mwc, I thought it would be wise to get an updated briefing. The briefer said that there were no reports of icing. I knew this because I had just flown in, and the WX had not significantly changed. I filed for 6000 ft, and received 4000 ft, with expectations of 6000 ft, in 10 min. When I leveled off at 4000 ft, I immediately began to pick up ice. Shortly, thereafter, I experienced a loss of my static instruments, as well as my airspeed indicator. Ice had accumulated to, close, to, an inch. I took the steps necessary to alleviate my instrument problems. I made repeated requests for different altitudes. The controller and I, came to a conclusion that he would help me back to mke. I was vectored for the approach, and made an uneventful landing. I learned that the WX reported is not always accurate. I learned that if one is not happy with a controller's instruments, then query that controller.

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Original NASA ASRS Text

Title: A PART 135 ACFT CONTINUED A FLT INTO ICING CONDITIONS, AND EXPERIENCED RELATED PITOT-STATIC FAILURES, AND HVY ICE ACCUMULATION, RESULTING IN A DIVERSION.

Narrative: ON THE PARTICULAR DAY IN QUESTION, I HAD SCHEDULED A FLT FROM DPA TO MWC AND IMMEDIATELY BACK TO DPA. IN MY USUAL ANTICIPATION OF A FLT. I CONSULTED DUATS AS WELL AS A FLT BRIEFER, FOR WX. THE CEILING WAS MEASURED 2400 FT OVCST, AND 40 DEGS FAHRENHEIT. THE CLOUD LAYER WAS RPTED TO BE 2000 FT THICK WITH WARM, CLR AIR, ABOVE. THE WX BELOW THE CLOUDS WAS BUMPY, WITH ONLY 10 MI VISIBILITY. FOR MY PAX SAKE, AS WELL AS THE ADDED SAFETY OF AN IFR FLT, I ELECTED TO FLY ABOVE THE CLOUDS. THE FLT UP, WENT WITHOUT A HITCH, WITHOUT ANY SIGN OF ICE. AFTER LNDG AT MWC, I THOUGHT IT WOULD BE WISE TO GET AN UPDATED BRIEFING. THE BRIEFER SAID THAT THERE WERE NO RPTS OF ICING. I KNEW THIS BECAUSE I HAD JUST FLOWN IN, AND THE WX HAD NOT SIGNIFICANTLY CHANGED. I FILED FOR 6000 FT, AND RECEIVED 4000 FT, WITH EXPECTATIONS OF 6000 FT, IN 10 MIN. WHEN I LEVELED OFF AT 4000 FT, I IMMEDIATELY BEGAN TO PICK UP ICE. SHORTLY, THEREAFTER, I EXPERIENCED A LOSS OF MY STATIC INSTS, AS WELL AS MY AIRSPD INDICATOR. ICE HAD ACCUMULATED TO, CLOSE, TO, AN INCH. I TOOK THE STEPS NECESSARY TO ALLEVIATE MY INST PROBS. I MADE REPEATED REQUESTS FOR DIFFERENT ALTS. THE CTLR AND I, CAME TO A CONCLUSION THAT HE WOULD HELP ME BACK TO MKE. I WAS VECTORED FOR THE APCH, AND MADE AN UNEVENTFUL LNDG. I LEARNED THAT THE WX RPTED IS NOT ALWAYS ACCURATE. I LEARNED THAT IF ONE IS NOT HAPPY WITH A CTLR'S INSTS, THEN QUERY THAT CTLR.

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.