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valve, and other internal surfaces of the carburetor. The venturi effect can reduce the air temperature by 39 K; 39 °C (70 °F). In other words, air at an outside temperature of 38 °C (100 °F), can drop to −1 °C (30 °F) in the carburetor. Carburetor icing most
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initially, but eventually restricts airflow, perhaps even causing a complete blockage of air to the carburetor. The engine begins to run more rich as ice formation increases. Without intervention (such as carburetor heating or manually adjusting the
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is above 80 percent. The risk of carburettor icing is significantly increased at partial power settings (such as when power is reduced during descent), due to the cooling effect of the partly-closed throttle.
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systems to counter icing. In road vehicles, carburetor icing can occasionally be a nuisance, although some engine designs are more susceptible to it than others. The
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The high ambient temperature at which it can occur often causes aircraft pilots to overlook the possibility of carb icing. The
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322:. Civil Aviation Safety Authority (Version 7.2 ed.). Canberra: Australian Government. 2023. pp. 96–97.
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Ice formation in the carburetor (left), and conditions conducive to the formation of carburetor ice (right).
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will form on the surfaces of the carburetor throat, further restricting it. This may increase the
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Carburetor icing is caused by the temperature drop in the carburetor, as an effect of fuel
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As mentioned earlier, one disadvantage of the float-type carburetor is its icing tendency.
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often occurs when the outside air temperature is below 21 °C (70 °F) and the
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While it can affect any carburetor, carburetor icing is of particular concern in
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130:. The problem is most notable in aviation engines using float-type carburetors.
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286:. US Dept. of Transportation, FAA. 2016. pp. 7-8–7-10. Archived from
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and parts of the carburetor often have warm water from the
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Pilot's
Handbook of Aeronautical Knowledge, FAA-H-8083-25B
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may be more prone to icing, due to the absence of warm
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141:. If the temperature drops below freezing,
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16:Condition which affects combustion engines
69:Learn how and when to remove this message
32:This article includes a list of general
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353:. You can help Knowledge (XXG) by
38:it lacks sufficient corresponding
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213:circulating through the engine.
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277:"Chapter 7: Aircraft Systems".
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400:Weather hazards to aircraft
254:Fuel system icing inhibitor
122:condition which can affect
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319:Visual Flight Rules Guide
53:more precise citations.
349:-related article is a
128:atmospheric conditions
145:will freeze onto the
207:Air-cooled engines
191:carburetor heating
189:are equipped with
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410:Carburettors
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295:. Retrieved
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234:Convair B-36
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135:vaporization
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203:exhaust gas
143:water vapor
124:carburetors
51:introducing
394:Categories
297:2023-02-25
261:References
34:references
239:Dew point
347:aviation
217:See also
183:aircraft
147:throttle
211:coolant
187:engines
139:venturi
47:improve
118:is an
36:, but
345:This
291:(PDF)
284:(PDF)
120:icing
351:stub
244:Fog
201:or
160:ice
110:In
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