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An IMC C182 private pilot notes his altimeter descending from 7000 ft towards 6000 ft and notifies mke approach of the anomaly east of bjb, wi.
| Attributes | |
| ACN | 476598 |
| Time | |
| Date | 200005 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | WI |
| Altitude | msl bound lower : 6000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Thunderstorm other |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mke.tracon |
| Operator | general aviation : personal |
| Make Model Name | Skylane 182/RG Turbo Skylane/RG |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 32 flight time total : 1276 flight time type : 1156 |
| ASRS Report | 476598 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather inflight encounter other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance controller : provided flight assist flight crew : declared emergency |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Aircraft |
| Primary Problem | Weather |
Narrative:
We were with mke, radar vectors to cgx. Quite suddenly, we were losing altitude. Temperature was 7 degrees C. We were IMC for the most part, but at times we had a misty 'view' of land (shoreline). We were east of course (with clearance) for WX. We were staying 30-50 mi for thunderstorm readings on our stormscope. I had been watching a thin, moist band on the leading edge of the wings. It was not ice that I could identify. I contacted and advised mke approach of our altitude loss. He turned us west toward west bend, inquired as to the number of souls (2), fuel (40 gallons), with the intent to take us toward west bend. In less than 1000 ft loss, we gained 2 degrees C of outside air temperature. Just as quickly, the altitude returned. I checked everything that my training taught me. Nothing was out of order (except the altitude loss). This new cessna is fuel injected, so there is no carburetor heat to apply. The gain of altitude was not accompanied by the 'chocking, coughing' sounds of carburetor icing. The 'film-like' moisture on the leading edge also disappeared as the temperature increased. I notified mke approach that everything was back to normal. He turned me back on course and turned me over to chicago approach for our visual approach into meigs. I have no idea what caused the problem. I've spoken with my long time mechanic. He's not sure what happened. I also spoke with an air safety counselor. He also was questioning what type of air filter the C182 has. It is paper. He thought that if it weren't, that might have been the source of the apparent icing, so he's mystified. This problem did not cause any problems to other aircraft. The problem did not recur. Any insight would be appreciated.
Original NASA ASRS Text
Title: AN IMC C182 PVT PLT NOTES HIS ALTIMETER DSNDING FROM 7000 FT TOWARDS 6000 FT AND NOTIFIES MKE APCH OF THE ANOMALY E OF BJB, WI.
Narrative: WE WERE WITH MKE, RADAR VECTORS TO CGX. QUITE SUDDENLY, WE WERE LOSING ALT. TEMP WAS 7 DEGS C. WE WERE IMC FOR THE MOST PART, BUT AT TIMES WE HAD A MISTY 'VIEW' OF LAND (SHORELINE). WE WERE E OF COURSE (WITH CLRNC) FOR WX. WE WERE STAYING 30-50 MI FOR TSTM READINGS ON OUR STORMSCOPE. I HAD BEEN WATCHING A THIN, MOIST BAND ON THE LEADING EDGE OF THE WINGS. IT WAS NOT ICE THAT I COULD IDENT. I CONTACTED AND ADVISED MKE APCH OF OUR ALT LOSS. HE TURNED US W TOWARD WEST BEND, INQUIRED AS TO THE NUMBER OF SOULS (2), FUEL (40 GALLONS), WITH THE INTENT TO TAKE US TOWARD WEST BEND. IN LESS THAN 1000 FT LOSS, WE GAINED 2 DEGS C OF OUTSIDE AIR TEMP. JUST AS QUICKLY, THE ALT RETURNED. I CHKED EVERYTHING THAT MY TRAINING TAUGHT ME. NOTHING WAS OUT OF ORDER (EXCEPT THE ALT LOSS). THIS NEW CESSNA IS FUEL INJECTED, SO THERE IS NO CARB HEAT TO APPLY. THE GAIN OF ALT WAS NOT ACCOMPANIED BY THE 'CHOCKING, COUGHING' SOUNDS OF CARB ICING. THE 'FILM-LIKE' MOISTURE ON THE LEADING EDGE ALSO DISAPPEARED AS THE TEMP INCREASED. I NOTIFIED MKE APCH THAT EVERYTHING WAS BACK TO NORMAL. HE TURNED ME BACK ON COURSE AND TURNED ME OVER TO CHICAGO APCH FOR OUR VISUAL APCH INTO MEIGS. I HAVE NO IDEA WHAT CAUSED THE PROB. I'VE SPOKEN WITH MY LONG TIME MECH. HE'S NOT SURE WHAT HAPPENED. I ALSO SPOKE WITH AN AIR SAFETY COUNSELOR. HE ALSO WAS QUESTIONING WHAT TYPE OF AIR FILTER THE C182 HAS. IT IS PAPER. HE THOUGHT THAT IF IT WEREN'T, THAT MIGHT HAVE BEEN THE SOURCE OF THE APPARENT ICING, SO HE'S MYSTIFIED. THIS PROB DID NOT CAUSE ANY PROBS TO OTHER ACFT. THE PROB DID NOT RECUR. ANY INSIGHT WOULD BE APPRECIATED.
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.