aircraft systemsFAA-published question bank (Private Pilot, 2008)
Which condition is most favorable to the development of carburetor icing?
A
Any temperature below freezing and a relative humidity of less than 50 percent.
B
Temperature between 32 and 50 °F and low humidity.
C
Temperature between 20 and 70 °F and high humidity.✓ Correct Answer
Explanation
PHAK Chapter 7 says carburetor ice is most likely with outside air temperatures between about 20 degrees F and 70 degrees F and visible moisture or high relative humidity, because the cooling in the carburetor can drop the air below freezing. Low humidity makes carburetor ice less likely, whatever the temperature.
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