C152 and partial carb heat
Just been reading through a Cessna C152 handbook, the one published by Cessna, think it was dated july 1978.
It suggests using by "by trial and error" partial carb. heat in the cruise to prevent ice. So for those that like to follow the POH to the letter, do they use carb. heat in such a manner? When i have 5 minutes i will cross check with an actual POH for a real aircraft. |
With partial carby heat its possible to raise the temp just enough to get into the range to produce carby icing.
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I thought I'd read pretty much all of the C152 manual, but didn't remember reading that bit. So I just pulled out a manual, and sure enough, there it is - not sure how I missed it. Here's a more complete quote:
Carburetor ice, as evidenced by an unexplained drop in RPM, can be removed by application of full carburetor heat. Upon regaining the original RPM (with heat off), use the minimum amount of heat (by trial and error) to prevent ice from forming. Since heated air causes a richer mixture, readjust the mixture setting when carburetor heat is to be used continuously in cruise flight. What I've always done, and what I will continue to do unless someone can tell me how to follow the POH to the letter, is apply regular carb heat to check for and remove ice, and, if I notice ice building up regularly in the cruise, use full carb heat. Planemad_bk - this is a story which I have heard many times, but which contradicts the POH, and which I have yet to see any good evidence for. FFF ------------------- |
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