Free flight changes June 19-21 for PHX afternoon arrivals/departures
Jun 17, 2017, 11:19 pm
#16
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http://www.boeing.com/commercial/aer...icle_04_1.html
The other issue facing AA is the very real risk of ground employee heat exhaustion/heat stroke at temperatures exceeding 120 F.
Jun 17, 2017, 11:44 pm
#17
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Among the limiting factors are tire speed ratings - even if you had a 12 mile runway, the speed required for takeoff at 122 F might exceed the tires' speed rating. Here's a Boeing article discussing the issue:
http://www.boeing.com/commercial/aer...icle_04_1.html
The other issue facing AA is the very real risk of ground employee heat exhaustion/heat stroke at temperatures exceeding 120 F.
http://www.boeing.com/commercial/aer...icle_04_1.html
The other issue facing AA is the very real risk of ground employee heat exhaustion/heat stroke at temperatures exceeding 120 F.
I actually think your point about employees on the ground is most relevant. If the temperature is 120 as they are forecasting I have to assume it feels more like 145 when you take into account the heat from the concrete and the planes themselves.
Im heading out of town Monday morning so glad I'll miss this. I can handle anything 110 or below with ease but once it's above that it's tough!
Jun 18, 2017, 3:53 am
#18
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Im heat intolerant, guess where work has sent me most of the last year? I may be from SAT. Howevere SAT only has problems normally one month or two out of a year and is far enough inland from thr Gulf. I take vacation tp NZ/AUSTRALIA during August for a reason.
Jun 18, 2017, 8:57 am
#19
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Since water vapor makes up such a small percentage of air, it has a lot less of an impact on air density than temperature though.
Jun 18, 2017, 12:00 pm
#20
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It has to be to get that hot in Phoenix. Humidity is forecast to be about 7-9%.
It is hot but there is a vast difference in how it feels compared to somewhere that has much higher humidity. In high humidity locations it's very common to have the heat index higher than the actual temperature. In Phoenix when it is this dry, the heat index can actually be below the actual temperature because any moisture coming out of your body evaporates so quickly.
It is hot but there is a vast difference in how it feels compared to somewhere that has much higher humidity. In high humidity locations it's very common to have the heat index higher than the actual temperature. In Phoenix when it is this dry, the heat index can actually be below the actual temperature because any moisture coming out of your body evaporates so quickly.
Jun 18, 2017, 12:49 pm
#21
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It has to be to get that hot in Phoenix. Humidity is forecast to be about 7-9%.
It is hot but there is a vast difference in how it feels compared to somewhere that has much higher humidity. In high humidity locations it's very common to have the heat index higher than the actual temperature. In Phoenix when it is this dry, the heat index can actually be below the actual temperature because any moisture coming out of your body evaporates so quickly.
It is hot but there is a vast difference in how it feels compared to somewhere that has much higher humidity. In high humidity locations it's very common to have the heat index higher than the actual temperature. In Phoenix when it is this dry, the heat index can actually be below the actual temperature because any moisture coming out of your body evaporates so quickly.
Jun 18, 2017, 1:33 pm
#23
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I would routinely get fantastic golf rates in Scottsdale during the summer in my visits there because nobody local was crazy enough to go play 18 in 110 degrees.
I tried telling them over here on the East Coast, 90deg and 90% humidity is so much worse, but they don't seem to believe me.
Heck yesterday I was near Cleveland helping a friend move and it was 88 and humid, so much worse to me. You are just so sticky and sweaty, it's awful!
I tried telling them over here on the East Coast, 90deg and 90% humidity is so much worse, but they don't seem to believe me.
Heck yesterday I was near Cleveland helping a friend move and it was 88 and humid, so much worse to me. You are just so sticky and sweaty, it's awful!
Jun 18, 2017, 2:14 pm
#24
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Jun 18, 2017, 2:25 pm
#25
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Same for ATX. Half the city leaves in August. The traffic is much better. We hop around a bit each year, Sweden and Iceland this August.
Jun 18, 2017, 3:27 pm
#26
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The PHX temps do sound like a nightmare for the workers. There will be some very hot planes at the gates as well. Not all of AA's planes, especially the older ones, cool very well. There will probably be some delays and cancellations for that reason alone.
Jun 18, 2017, 3:58 pm
#28
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It's both. There are some aircraft for which performance data is not calculated beyond 50C (122F). And some aircraft may hit WAT (weight, altitude, temperature) limits at much lower temperatures depending on other factors. Don't assume that the same factor is always the constraint. Different factors will be the controlling one in different conditions. Tire speed, as pointed out above by FWAAA, is one. Maximum brake energy is another. A rejected takeoff at high speed makes for very hot brakes. Very hot brakes can cause fires.
Jun 18, 2017, 4:09 pm
#29
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The note above it good. Here's an example of calculating takeoff distance https://www.youtube.com/watch?v=IY0EOnarOCI. Note that the temperature scale only goes to 40C. Above that, you're not allowed to takeoff as the manufacturer has not provided data for your conditions. Manufacturers will sell extended temperature performance charts, but some airlines don't pay for them for some aircraft type. At that point, you just need to wait.
Last edited by CPRich; Jun 18, 2017 at 4:24 pm