GoneWest
4th Oct 2001, 06:58
Just read a flight safety item in an American magazine...which taught me something I never knew about carb heat.
<<About 8% of the verified engine failures were due to carburetor ice, often when the pilot ignored the need for carb. heat, but sometimes when the carb heat was used properly.
Aircraft certification requirements state that a carb-equipped engine must be able to take 30-degree incoming air and deliver it to the carburetor at 120 degrees, which is hot enough to melt carb ice and prevent more from forming. However, the certification requirements allow the manufacturer to use 75 percent power to heat the air>>
So, when pilots drag on the carb heat because they have decided to close the throttle and enter a glide (way below 75 percent power) - it may all be a waste of time and not producing enough heat to do any good.
Could be scary in the wrong (or "right") conditions.
Any comments from pilots or instructors? Any examples?...or anybody disagree?
<<About 8% of the verified engine failures were due to carburetor ice, often when the pilot ignored the need for carb. heat, but sometimes when the carb heat was used properly.
Aircraft certification requirements state that a carb-equipped engine must be able to take 30-degree incoming air and deliver it to the carburetor at 120 degrees, which is hot enough to melt carb ice and prevent more from forming. However, the certification requirements allow the manufacturer to use 75 percent power to heat the air>>
So, when pilots drag on the carb heat because they have decided to close the throttle and enter a glide (way below 75 percent power) - it may all be a waste of time and not producing enough heat to do any good.
Could be scary in the wrong (or "right") conditions.
Any comments from pilots or instructors? Any examples?...or anybody disagree?