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Carb Icing (Re: Throttle)

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dsavarese0812(at)bellsout
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Posted: Mon Oct 19, 2009 5:07 am Post subject: Carb Icing (Re: Throttle)

In the September issue of Sport Aviation (EAA magazine) there  was an excellent article on page 80 titled "Carburetor Icing Prevention; Special  Airworthiness Information Bulletin".  It was written by Peter L.  Rouse, Aerospace Engineer, of the FAA's Special Airplane  Directorate.

  

 In the article there is a graph which shows the  probability of carb icing for various temperatures and relative  humidity conditions.  What stands out is the very small area in the graph  where a pressure type carburetor is "susceptible" to icing.

  

 The article says:

 To recognize carburetor icing, the warning signs  are;

 - A drop in rpm in fixed-pitch propeller  airplanes

 - A drop in manifold pressure in constant-speed propeller  airplanes

 - In both types, usually there will be rough engine  operation

  

 If you don't have a copy of the magazine, do try to get it or  at least have someone copy the article for you.

  

 Dennis

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