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Old 02-06-2014, 11:50 AM
 
Location: San Antonio, Texas
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I'm feeling kinda unwell so I've just been laying in bed all day. But I know that it's below freezing outdoors. So I'm laying here with my head atop a comfy pillow & it seems to be that there's a lot more airliner noise than usual. Do they have to increase the throttle due to the cold air temperatures? Or is it something else?

Or is it just my crazy imagination? Anyone else notice what I'm talking about?
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Old 02-06-2014, 11:56 AM
 
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Atmospheric conditions can amplify the effects of the noise, and depending on weather conditions, they do alter the approaches/departures. When it is foggy, or there is a low ceiling, the planes approaching SAT come in from the NW right over the Fair Oaks area, and drop out of the clouds right over my neighborhood. You can almost count rivets some times.

In other news, hope you're back to feeling well soon.
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Old 02-06-2014, 12:25 PM
 
Location: San Antonio. Tx 78209
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I believe that SAT is required to route as many flight to the north as possible now due to noise issue complaints from neighborhoods from the south.
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Old 02-06-2014, 12:54 PM
 
Location: San Antonio
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Probably a combo of some reroutes due to weather, and the cloud cover bouncing the sound downwards.
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Old 02-06-2014, 12:59 PM
 
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Quote:
Originally Posted by smuboy86 View Post
I believe that SAT is required to route as many flight to the north as possible now due to noise issue complaints from neighborhoods from the south.
I don't think that has anything to do with it. The FAA determines which runway would be most appropriate, based on a number of factors, and one of the primary determining factors is wind direction. Winds have been out of the north today, and airplanes ideally take off into the wind.

I thought I saw them using Runway 4 for departures earlier today, which would mean they are taking off in a NE direction. Also, we have a cloud deck, which helps to deflect the noise back down toward the ground. Runway 4-22 had been closed for several months until recently, for construction projects.
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Old 02-06-2014, 01:00 PM
 
Location: San Antonio, Texas
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Interesting stuff. Thanks, everyone!
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Old 02-06-2014, 01:53 PM
 
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Quote:
Originally Posted by ged_782 View Post
I don't think that has anything to do with it. The FAA determines which runway would be most appropriate, based on a number of factors, and one of the primary determining factors is wind direction.
Absolutely THE primary determining factor.
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Old 02-06-2014, 02:10 PM
 
Location: San Antonio
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Quote:
Originally Posted by ged_782 View Post
I don't think that has anything to do with it. The FAA determines which runway would be most appropriate, based on a number of factors, and one of the primary determining factors is wind direction. Winds have been out of the north today, and airplanes ideally take off into the wind.

I thought I saw them using Runway 4 for departures earlier today, which would mean they are taking off in a NE direction. Also, we have a cloud deck, which helps to deflect the noise back down toward the ground. Runway 4-22 had been closed for several months until recently, for construction projects.
To be totally correct, the pilot usually has a choice in which runway to utilize and according to his operating parameters make the final decision. For instance, there are times I will use runway 4, even with a slight tailwind, since it is closest and points me in the direction I want to go.

With a cloud deck and cold air, sound is intensified and travels farther.
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Old 02-06-2014, 03:12 PM
 
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SAT has been routing traffic for past several days onto runway 4-22 for inbound. They often do this when winds are favorable (winter) and allows them to do maintenance on 12R-30L. And since 4-22 was closed for construction for a while, they no doubt have plenty of maintenance to do. Maintenance actions may include things like rubber removal, which is critical to keeping it safe for landing during wet conditions. If you live south of the airport you will get plenty of traffic on approach coming in low over the city when they make this change.
http://155.178.201.160/d-tpp/1402/00369AD.PDF
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Old 02-08-2014, 07:15 PM
 
Location: San Antonio, TX
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Quote:
Originally Posted by ged_782 View Post
I don't think that has anything to do with it. The FAA determines which runway would be most appropriate, based on a number of factors, and one of the primary determining factors is wind direction. Winds have been out of the north today, and airplanes ideally take off into the wind.

I thought I saw them using Runway 4 for departures earlier today, which would mean they are taking off in a NE direction. Also, we have a cloud deck, which helps to deflect the noise back down toward the ground. Runway 4-22 had been closed for several months until recently, for construction projects.
True, but noise abatement is a big consideration and is factered into the direction of a plane's climb rate and direction...
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