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Pilot of C210 encounters icing during IFR flight west of missoula, mt. During course reversal over mountainous terrain he descends to 8600 ft vice cleared altitude of 9500 ft.
| Attributes | |
| ACN | 631422 |
| Time | |
| Date | 200409 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mso.airport |
| State Reference | MT |
| Altitude | msl bound lower : 8600 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Ice |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | general aviation : personal |
| Make Model Name | Cessna 210 Centurion / Turbo Centurion 210C, 210D |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 1500 flight time type : 1000 |
| ASRS Report | 631422 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter other non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft Environmental Factor Flight Crew Human Performance Weather |
| Primary Problem | Environmental Factor |
Narrative:
I was flying in broken clouds at 10000 ft over missoula when I entered substantial precipitation in a solid cloud. Ice began forming on the struts and I asked for lower. I was given 9500 ft but continued to experience icing. I then requested a 180 degree turn out of the precipitation, and was granted the turn. As I turned I allowed the aircraft to descend to 8600 ft. I was paying too much attention to getting out of the ice and not enough to holding my altitude. During the turn I was also trying to reconfigure the VOR's and GPS's to change direction. I should have just used the heading bug until I was stabilized. As an aside, ATC had also been working a C172 that had also iced up. ATC did not, however, inform me of the icing. They actually seemed surprised that I was icing up. There was an air met but it was for 10000 ft and up. That altitude was above freezing until the precipitation.
Original NASA ASRS Text
Title: PLT OF C210 ENCOUNTERS ICING DURING IFR FLT W OF MISSOULA, MT. DURING COURSE REVERSAL OVER MOUNTAINOUS TERRAIN HE DSNDS TO 8600 FT VICE CLRED ALT OF 9500 FT.
Narrative: I WAS FLYING IN BROKEN CLOUDS AT 10000 FT OVER MISSOULA WHEN I ENTERED SUBSTANTIAL PRECIPITATION IN A SOLID CLOUD. ICE BEGAN FORMING ON THE STRUTS AND I ASKED FOR LOWER. I WAS GIVEN 9500 FT BUT CONTINUED TO EXPERIENCE ICING. I THEN REQUESTED A 180 DEG TURN OUT OF THE PRECIPITATION, AND WAS GRANTED THE TURN. AS I TURNED I ALLOWED THE ACFT TO DSND TO 8600 FT. I WAS PAYING TOO MUCH ATTN TO GETTING OUT OF THE ICE AND NOT ENOUGH TO HOLDING MY ALT. DURING THE TURN I WAS ALSO TRYING TO RECONFIGURE THE VOR'S AND GPS'S TO CHANGE DIRECTION. I SHOULD HAVE JUST USED THE HDG BUG UNTIL I WAS STABILIZED. AS AN ASIDE, ATC HAD ALSO BEEN WORKING A C172 THAT HAD ALSO ICED UP. ATC DID NOT, HOWEVER, INFORM ME OF THE ICING. THEY ACTUALLY SEEMED SURPRISED THAT I WAS ICING UP. THERE WAS AN AIR MET BUT IT WAS FOR 10000 FT AND UP. THAT ALT WAS ABOVE FREEZING UNTIL THE PRECIPITATION.
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.