Apuneger From Belgium, joined Sep 2000, 3032 posts, RR: 11
Reply 1, posted (12 years 12 months 2 hours ago) and read 1521 times:
I don't think the aircraft sound increases/decreases. Maybe if you go out and measure it with a scientific machine it could notice a slight increase, due to the increased density of the air when it's cold.
Another thing: if I'm correct aircraft should take less runway lentgh to take off, since the lower temperature means higher air density, which means they can reach the necessary amount of lift earlier (maybe only a few feet or so, I don't know).
About the approaches: this depends on the prevailing wind and other meteorologic conditions, but frankly, I've never seen aircraft doing other approaches over here at BRU when it gets colder.
Maybe somewhere in Norway or Siberia or so, where normal approach is over water, they might change the approach because the water is frozen or so, or is just too cold, I don't know...
CactusA319 From United States of America, joined Jan 2000, 2918 posts, RR: 23
Reply 2, posted (12 years 12 months 2 hours ago) and read 1510 times:
Aircraft noise doesn't increase significantly in the winter, at least not from a decibel standpoint. It may appear to be a little louder but that may be due to cold air as well as less ambient noise during the winter months (not as many people outside, etc. )
Aircraft performance improves in cold weather due to increased air density. Aircraft use less runway for take-off and their climb rate is higher than during the summer months.
Some aircraft use different approaches during the winter time but its due to the prevailing winds, not temperature. For example here at ORD, aircraft tend to use the westbound runways more during the winter because the prevailing winds tend to be more westerly, whereas in the summer the opposite is true.