>if the OAT is below the carb ice range then carb heat could warm the air up to the point where carb ice can form. <
I seem to recall a mention of this but it was then almost dismissed with comments about very low humidity with the cold temps.
>I was taught to bring the carb heat on before bringing power below the green arc as a precaution, because if it's needed later the engine will be too cold for it to be effective<
Moi aussi.
Perhaps some of the comments here relate to vastly different climates and humidities.
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