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I am enrolled in the Part 107 Ground School. After completing the Weather & Micro-meteorology section in the Quiz section question 10 /25. Why is frost considered hazardous to sUAS operations. Options are 1) Frost decrease lift capacity by changing the aerodynamic shape of the propellers. 2) Frost decreases lift capacity by spoiling the smooth air over the propellers. 3) Frost increases control effectiveness by slowing the airflow. The Quiz marks #2 as the correct answer. I went with #1 According to your lecture in section on icing on page 23 there is the following paragraph (half way through) "In the same way that frost can change the aerodynamic qualities of the propellers, ice can do the same thing" Can you point me to the section in the lecture that provides the explanation for #2 being the correct answer?.