and on piston planes carb heat is turned on as part of the landing checklist. It's usually only used during landing. Why? You're at altitude where the air around and being pulled through the carb is colder, but most importantly the engine has been throttled back to idle for decent. Idle produces the most vacuum thus the most cooling/icing potential as noted by earlier posters. Icing might not happen at all, but if it did--well, flying is one place having an engine fail to give full power right on cue can be life ending.
Turning on carb heat is usually part of the emergency steps taken if the engine starts to quit on you in flight. Right along with setting the mixture to rich and giving it full throttle etc. Carb icing can cause rough running and lack of full power due to restriction and turbulence of the air through the iced up carb and if it's bad enough ice can freeze up the linkage or butterfly valve preventing you from operating the throttle.
Carb heat pulls intake air from a shroud over the exhaust manifold. Interestingly the switch point for the intake air source is made aft the air filter thus eliminating a problems due to a clogged air filter when using carb heat as well. Given the plane was in the air and the limited use of carb heat, dirty air was not a concern.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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