I live about 20 miles from a busy airport and am underneath one of the approaching flight paths. Often when a commercial jet passes overhead, it suddenly gets much louder, sort of like a car shifting down. It definitely sounds like the turbines are revving up. Why would an airplane get much louder while descending?
In: Engineering
Part of it is because it’s descending, so getting physically closer. The main reason though is because aircraft land into the wind. That means as you’re looking at it coming towards you, the wind is blowing the engine noise away from you. As it passes overhead and continues away from you, the wind is now blowing the noise to you.
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