Narrative:

IFR flight in VFR conditions from colorado to cedar city; ut. Severe turbulence and windshear. Had difficulty keeping altitude with up and downdrafts of 500-800 FPM. When wbound on V244 from hanksville VOR towards the milford VOR at 16000 ft in area 40 mi east of milford VOR (which chart indicates is changeover location for VOR guidance); lost directional indication from both vors and radio transmission was weak to non existent. When I finally picked up ZLC and asked to climb to 17000 ft in hopes of getting to less turbulent level; was told by controller; in annoyed tone; that I was not at assigned altitude of 16000 ft (had been blown to 16500 ft). When I stated that I could not receive VOR was told 'that is no excuse.' asked for ILS 20 into cedar city and was directed to intersection; when left turbo lost partial power. Cedar city is at 5626 ft altitude and had a density altitude that day in excess of 7000 ft. I asked same controller to cancel IFR (was in full VFR conditions) and give me vectors to the airport. I told him I had lost a turbo and his response was to the effect; 'you have now made 2 mistakes regarding your clearance.' I was asked to call center upon landing and explained above situation to supervisor. He seemed understanding and suggested that I tell the controller more detail about the turbulence in the future. Most controllers are very helpful. When there is a variation to assigned altitude they communicate with a suggestion to check altimeter setting or to check altitude. I suggest that this concept be communicated to the controller involved here. At the same time; the problem with controling my aircraft took my full attention and did not give me the opportunity to consider sharing the information regarding the severe turbulence with the center.

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Original NASA ASRS Text

Title: FLYING IFR IN VMC; PLT OF HIGH PERFORMANCE RECIPROCATING TWIN EXPERIENCES SEVERE TURBULENCE; LOSS OF VOR RECEPTION AND A FAILURE OF THE LEFT TURBOCHARGER INBOUND TO CDC; A HIGH ALT ARPT. TAKES UMBRAGE AT ARTCC CTLR'S VERBAL LACK OF UNDERSTANDING.

Narrative: IFR FLT IN VFR CONDITIONS FROM COLORADO TO CEDAR CITY; UT. SEVERE TURB AND WINDSHEAR. HAD DIFFICULTY KEEPING ALT WITH UP AND DOWNDRAFTS OF 500-800 FPM. WHEN WBOUND ON V244 FROM HANKSVILLE VOR TOWARDS THE MILFORD VOR AT 16000 FT IN AREA 40 MI E OF MILFORD VOR (WHICH CHART INDICATES IS CHANGEOVER LOCATION FOR VOR GUIDANCE); LOST DIRECTIONAL INDICATION FROM BOTH VORS AND RADIO XMISSION WAS WEAK TO NON EXISTENT. WHEN I FINALLY PICKED UP ZLC AND ASKED TO CLB TO 17000 FT IN HOPES OF GETTING TO LESS TURBULENT LEVEL; WAS TOLD BY CTLR; IN ANNOYED TONE; THAT I WAS NOT AT ASSIGNED ALT OF 16000 FT (HAD BEEN BLOWN TO 16500 FT). WHEN I STATED THAT I COULD NOT RECEIVE VOR WAS TOLD 'THAT IS NO EXCUSE.' ASKED FOR ILS 20 INTO CEDAR CITY AND WAS DIRECTED TO INTXN; WHEN L TURBO LOST PARTIAL PWR. CEDAR CITY IS AT 5626 FT ALT AND HAD A DENSITY ALT THAT DAY IN EXCESS OF 7000 FT. I ASKED SAME CTLR TO CANCEL IFR (WAS IN FULL VFR CONDITIONS) AND GIVE ME VECTORS TO THE ARPT. I TOLD HIM I HAD LOST A TURBO AND HIS RESPONSE WAS TO THE EFFECT; 'YOU HAVE NOW MADE 2 MISTAKES REGARDING YOUR CLRNC.' I WAS ASKED TO CALL CTR UPON LNDG AND EXPLAINED ABOVE SITUATION TO SUPVR. HE SEEMED UNDERSTANDING AND SUGGESTED THAT I TELL THE CTLR MORE DETAIL ABOUT THE TURB IN THE FUTURE. MOST CTLRS ARE VERY HELPFUL. WHEN THERE IS A VARIATION TO ASSIGNED ALT THEY COMMUNICATE WITH A SUGGESTION TO CHK ALTIMETER SETTING OR TO CHK ALT. I SUGGEST THAT THIS CONCEPT BE COMMUNICATED TO THE CTLR INVOLVED HERE. AT THE SAME TIME; THE PROB WITH CTLING MY ACFT TOOK MY FULL ATTN AND DID NOT GIVE ME THE OPPORTUNITY TO CONSIDER SHARING THE INFO REGARDING THE SEVERE TURB WITH THE CTR.

Data retrieved from NASA's ASRS site as of May 2009 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.