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ATL Taxiway Alignment Question  
User currently offlineChristao17 From Thailand, joined Apr 2005, 941 posts, RR: 8
Posted (8 years 7 months 3 weeks 2 days 19 hours ago) and read 1773 times:


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This cool aerial photo of ATL brought a question to my mind that perhaps the experts on a.net can answer:

Why are the taxiways between runways 26L and 26R, and to the north of 26R, not aligned straight with the runways? Instead, they jog over near the ends of the runways.

If I recall, the old terminal at ATL used to be to the north (right side) of the picture, so perhaps that explain the northernmost taxiway, but what I've observed at most other airports with closely-spaced parallel runways is that the taxiways follow the same straight path as the runways.

Anyone care to shed some light on this?


Keeping the "civil" in civil aviation...
6 replies: All unread, jump to last
 
User currently offlineN774UA From Netherlands, joined Aug 2004, 343 posts, RR: 0
Reply 1, posted (8 years 7 months 3 weeks 2 days 17 hours ago) and read 1755 times:

My guess would be that it has something to do with the ILS sensitive area.

Regards
N774UA



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User currently offlineChristao17 From Thailand, joined Apr 2005, 941 posts, RR: 8
Reply 2, posted (8 years 7 months 3 weeks 2 days 15 hours ago) and read 1732 times:

Quoting N774UA (Reply 1):
My guess would be that it has something to do with the ILS sensitive area.

That was one of the possible answers I though of, but then I notice that the middle taxiway actually cuts over closer to the approach area of runway 26R, which is the primary landing runway (evidenced by the skid marks) on the north side of the ATL complex. If it gets closer to the runway at the approach end, I would think it more likely that it would interfere with the ILS sensitive area.



Keeping the "civil" in civil aviation...
User currently offlineRL757PVD From United States of America, joined Dec 1999, 4676 posts, RR: 11
Reply 3, posted (8 years 7 months 3 weeks 2 days 15 hours ago) and read 1729 times:

Quoting N774UA (Reply 1):
My guess would be that it has something to do with the ILS sensitive area.

That is correct, while not noticable in the picture, there are im pavement marking seperate form the runway hold position markings that identify this area on the ground.



Experience is what you get when what you thought would work out didn't!
User currently offline73G From United States of America, joined Jan 2006, 128 posts, RR: 1
Reply 4, posted (8 years 7 months 3 weeks 2 days 13 hours ago) and read 1664 times:

Quoting Christao17 (Reply 2):
I would think it more likely that it would interfere with the ILS sensitive area.

Actually, it would interfere with the ILS components. Look to the right of the 1000' markings on both 26L and 26R. See the grey, circular areas with the small white box in each of them? Those are the glideslope antennae. The taxiways have to be routed around those antennae.


User currently offlineDeltaGator From United States of America, joined Sep 2005, 6341 posts, RR: 13
Reply 5, posted (8 years 7 months 3 weeks 2 days 13 hours ago) and read 1659 times:

One other thing to consider is that the runways in ATL used to intersect and that the taxiways (more evident on the south side of the field) use some of the original runways. It looks more like the ILS issue on the northern side but might have a little to do with original placement of runways.


"If you can't delight in the misery of others then you don't deserve to be a college football fan."
User currently offlineChristao17 From Thailand, joined Apr 2005, 941 posts, RR: 8
Reply 6, posted (8 years 7 months 3 weeks 2 days 12 hours ago) and read 1625 times:

Quoting 73G (Reply 4):
Look to the right of the 1000' markings on both 26L and 26R. See the grey, circular areas with the small white box in each of them? Those are the glideslope antennae.

I see them - that makes perfect sense. Thanks for clarifying this.



Keeping the "civil" in civil aviation...
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