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
I haven’t seen anyone mention how slowly the engines spool up and down. Until you’re on the ground and slowed significantly, you always need to have a plan to abort the landing. You’re going super low and slow by the time you near the ground. You’re going to run out of energy and stall if you try to abort the landing and go around without adding thrust. Eventually you get close enough to the ground that you can’t just add power from idle and expect the thrust to come before you’re out of time, so you rev the engines up a little. That way you’ll be making good thrust in a second or two rather than needing to wait several seconds.
Edit: [Source](https://www.google.com/amp/s/amp.usatoday.com/amp/1046488001)
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