|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||atc facility : avl|
|Altitude||msl bound lower : 8000|
msl bound upper : 8000
|Controlling Facilities||tracon : avl|
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Fixed Gear|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : cfi|
pilot : instrument
pilot : commercial
|Experience||flight time last 90 days : 60|
flight time total : 1500
flight time type : 1000
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
|Resolutory Action||aircraft : equipment problem dissipated|
flight crew : declared emergency
flight crew : overcame equipment problem
|Primary Problem||Flight Crew Human Performance|
Engine felt rough prior to crossing mountains from sug to sot to knoxville. I had previously departed gsp in an small aircraft. I have 200 hours on my engine since overhaul and have had one cylinder removed and repaired because of a stuck valve. The engine was overhauled by FBO at cape gorado below st louis. I suspect carburetor ice, but I was not sure it was not a sticking valve. The engine felt rough, I applied full carburetor heat and leaned with mixture. After a minute or so had passed, I pushed the carburetor heat back to 'opp' and the engine appeared to almost quit. I reapplied carburetor heat and the engine came to life again. I requested vectors to a field where I could have the engine checked out, and was vectored to asheville, nc, where I landed. For the first 3000' of descent, the engine ran very rough, then smoothed out prior to landing. A local flight instrument who I presume was more familiar with mountain flying, ran my engine up and suggested that the engine was running smoothly and that maybe I had encountered carburetor ice. I refueled and flew on back to lexington, ky, via knoxville west/O incident.
Original NASA ASRS Text
Title: GA SMA DIVERTED TO ALTERNATE DUE ROUGH ENGINE AT COURSE.
Narrative: ENG FELT ROUGH PRIOR TO XING MOUNTAINS FROM SUG TO SOT TO KNOXVILLE. I HAD PREVIOUSLY DEPARTED GSP IN AN SMA. I HAVE 200 HRS ON MY ENG SINCE OVERHAUL AND HAVE HAD ONE CYLINDER REMOVED AND REPAIRED BECAUSE OF A STUCK VALVE. THE ENG WAS OVERHAULED BY FBO AT CAPE GORADO BELOW ST LOUIS. I SUSPECT CARB ICE, BUT I WAS NOT SURE IT WAS NOT A STICKING VALVE. THE ENG FELT ROUGH, I APPLIED FULL CARB HEAT AND LEANED WITH MIXTURE. AFTER A MINUTE OR SO HAD PASSED, I PUSHED THE CARB HEAT BACK TO 'OPP' AND THE ENG APPEARED TO ALMOST QUIT. I REAPPLIED CARB HEAT AND THE ENG CAME TO LIFE AGAIN. I REQUESTED VECTORS TO A FIELD WHERE I COULD HAVE THE ENG CHKED OUT, AND WAS VECTORED TO ASHEVILLE, NC, WHERE I LANDED. FOR THE FIRST 3000' OF DSCNT, THE ENG RAN VERY ROUGH, THEN SMOOTHED OUT PRIOR TO LNDG. A LCL FLT INSTR WHO I PRESUME WAS MORE FAMILIAR WITH MOUNTAIN FLYING, RAN MY ENG UP AND SUGGESTED THAT THE ENG WAS RUNNING SMOOTHLY AND THAT MAYBE I HAD ENCOUNTERED CARB ICE. I REFUELED AND FLEW ON BACK TO LEXINGTON, KY, VIA KNOXVILLE W/O INCIDENT.
Data retrieved from NASA's ASRS site as of August 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.