kparke777 From United States of America, joined Apr 2007, 39 posts, RR: 0 Posted (3 years 3 weeks 1 day 4 hours ago) and read 3226 times:
At LAX, why are the 24's N of the 25's? I thought that 25 should be N of 24 but at LAX the opposite is true with 24 being N of 25. At PHX, our home, 26 is N of 25 which aligns with the headings.
ANITIX87 From United States of America, joined Mar 2005, 3233 posts, RR: 14 Reply 2, posted (3 years 3 weeks 19 hours ago) and read 3076 times:
Quoting kparke777 (Thread starter): At LAX, why are the 24's N of the 25's? I thought that 25 should be N of 24 but at LAX the opposite is true with 24 being N of 25. At PHX, our home, 26 is N of 25 which aligns with the headings.
Why are the 24s and 25s the primary runways? Because they're used more often? I think it makes perfect sense, because 06L/R is north of 07L/R, and those are "closer" to North.
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vikkyvik From United States of America, joined Jul 2003, 8225 posts, RR: 28 Reply 3, posted (3 years 3 weeks 19 hours ago) and read 3074 times:
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Quoting swiftski (Reply 1): You can have 25L, 25C, 25R but you can't have four, i.e. 25L, 25LC, 25RC, 25R. This is why they are given another runway number.
At PHX they are all 257, so same applies.
It always sort of puzzled me why PHX didn't give their runways L/C/R designations, given that they only have 3 runways. I just figured they wanted to avoid confusion as to which side (north or south) an airplane was using. That or they had plans to build a 4th which never got done.
Quoting swiftski (Reply 1): All the 24' and 25' runways have the same heading (249).
I believe that the 25s were also built well before the 24s. So when they added the two northern runways, they gave them the next closest designation.
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MrSkyGuy From United States of America, joined Aug 2008, 1203 posts, RR: 3 Reply 4, posted (3 years 3 weeks 17 hours ago) and read 3017 times:
I also think there's a rule of thumb depending on where the terminal is located. At Midway for example, the terminal doesn't "split" the runways.. it's to the right completely, giving room for "C" designators on the middle runway. LAX on the other hand splits the runways neatly with 2 on each side.
General flow is typically landing traffic on the outboard runways, departing on the inboards.
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The other two were 9L/27R and 9R/27L. Apparently there was confusion that sometimes resulted in aircraft mis-identifying the runways and thinking the new runway was 9L/27R.
About a year later they renumbered the new runway to become 8L/26R. Runway 9L/27R was changed to 8R/26L, and 9R/27L was changed to 9/27. I guess they considered it less confusing to have the 2 runways close together to have the same numbers and L/R designations,and the more distant runway to have the unique numbers.
StarAC17 From Canada, joined Aug 2003, 3226 posts, RR: 9 Reply 6, posted (3 years 2 weeks 6 days 12 hours ago) and read 2698 times:
Quoting vikkyvik (Reply 3): It always sort of puzzled me why PHX didn't give their runways L/C/R designations, given that they only have 3 runways. I just figured they wanted to avoid confusion as to which side (north or south) an airplane was using. That or they had plans to build a 4th which never got done.
YYZ has 3 parallel runways as well and doesn't use a "C" designation either and I would think for the same reason as 24L/R and 6L/R are southern runways and has 5/23 on the north side.
A center runway has to be a true central runway where they are spaced reasonably evenly.
vikkyvik From United States of America, joined Jul 2003, 8225 posts, RR: 28 Reply 7, posted (3 years 2 weeks 6 days 3 hours ago) and read 2595 times:
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Quoting StarAC17 (Reply 6): A center runway has to be a true central runway where they are spaced reasonably evenly.
Well, it doesn't have to be, far as I know. I'm sure it's significantly more prudent to do it that way, though.
DFW has 17-35L/C/R I believe, with two of them fairly close, and one a significantly farther distance away. Of course, they all are on the same side of the terminal. They're the parallels on the left side of the photo:
StarAC17 From Canada, joined Aug 2003, 3226 posts, RR: 9 Reply 8, posted (3 years 2 weeks 3 days 10 hours ago) and read 2432 times:
Quoting vikkyvik (Reply 7): DFW has 17-35L/C/R I believe, with two of them fairly close, and one a significantly farther distance away. Of course, they all are on the same side of the terminal. They're the parallels on the left side of the photo:
Fair enough but it has the same idea as airports like LAX and YYZ + many more as those ones have one heading for one side of the terminal and one for the other side.
I presume the ones on the right are 18-36L/R
Also ATL is laid out similar to DFW and has 9-27L/R and 10/28 on the same side and IMO I think it would make sense to have a 9-27C in there instead.
vikkyvik From United States of America, joined Jul 2003, 8225 posts, RR: 28 Reply 9, posted (3 years 2 weeks 3 days 2 hours ago) and read 2370 times:
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Quoting StarAC17 (Reply 8): Fair enough but it has the same idea as airports like LAX and YYZ + many more as those ones have one heading for one side of the terminal and one for the other side.
Yeah that's certainly true.
Quoting StarAC17 (Reply 8): I presume the ones on the right are 18-36L/R
Yup!
Quoting StarAC17 (Reply 8): Also ATL is laid out similar to DFW and has 9-27L/R and 10/28 on the same side and IMO I think it would make sense to have a 9-27C in there instead.
I almost mentioned ATL in my previous post. That one has always confused me - they have 3 different runway designations for 5 parallel runways (8-26L/R, 9-27L/R, and 10-28). But I assume it was another confusion-elimination strategy.
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