# Questions tagged [parallel-runways]

Questions about runways at the same airport that are parallel to each other.

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### Why was the second runway at Sea-Tac Airport built so close to the first?

The second runway (the eastern 16L/34R) was built 800ft. to the east of the original runway 16C. Almost immediately it was criticised as being unusable for simultaneous operations unless using VFR ...
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### How does a TCAS system avoid unnecessary (RAs) resolution advisories when aircraft are operating on separate closely spaced parallel runways?

How does a TCAS system avoid unnecessary (RAs) resolution advisories when aircraft are operating on separate closely spaced parallel runways (e.g. 2500 feet or less separation between rwy centerlines)....
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### Why would an airport use an L/R runway combination and a second number instead of L/C/R?

At KPHX, there's a Runway 25L/R and a runway 26. What would the reasoning be for using this instead of what seems to be the more common L/C/R designation?
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### How to find runway Centerline spacing on airport diagrams?

I know that airport diagrams show the exact position of airport runways in DMS (degrees, minutes, seconds) and therefore could use trigonometry to find how far apart runway centerlines are from ...
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### How many US airports have 4 or more parallel runways?

Which airports in the US have four or more parallel runways? How many are planning additions in the next 5 years? A few years back, 10 years, Charlotte opened their 3rd parallel runway and it was ...
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### Why are Gatwick's runways too close together?

Gatwick Airport has two runways (08L/26R and 08R/26L), but they are only 200 metres apart - too close (by just ten metres) to allow simultaneous operations on both runways. As a result, usually only ...
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### How are parallel runways named if there are more than 2 or 3? [duplicate]

I know that it's very common for runways to have a parallel neighbor, and they're normally called left and right. I have also seen some runways called "center" if there are three parallel runways. ...
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### How does a pilot select the correct ILS when the airport has parallel runways?

How do you not mess up ILS on parallel runways? There are many airports with ILS and parallel runways, how do you select which ILS for the runway you want? For example there are RWY 22L AND 22R and ...
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### Why is there no numbering system for more than three parallel runways?

If an airport has three parallel runways - a good example being Schiphol (EHAM/AMS) - the parallels are usually labeled "left", "center", and "right", and in case of Schiphol they are 18/36 L/C/R. ...
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### Why do simultaneous-ops parallel runways need to be so far apart?

In the answers to this question about Denver's widely-scattered pinwheel of runways and this question about Schiphol's runway out in the middle of nowhere, it's mentioned that parallel runways are ...
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### How does the capacity of 2 parallel runways compare to single runway?

Under IFR, what is the capacity of 2 near parallel runways and how does it compare to mixed mode single runway?
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### How is separation managed when there are only two parallel runways in a very busy airport?

In the world's busiest airports, how is separation managed between departures and arrivals when there are only two parallel runways like in London Heathrow. What is the minimum safe separation?
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### Why would the runway separation for parallel triple simultaneous precision approaches be dependent on airport elevation?

Based on FAA advisory circular AC 150/5300-13A, Airport Design, when operating triple simultaneous precision instrument approaches the parallel runway separation could be reduced from 5000 feet to ...
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### What is the minimum distance allowed between two parallel runways?

Is there an international regulation for this matter or does it differ from one country to another?
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### What are the most efficient layouts of multiple runways?

Many airports have more than one runway. How should runways be built in order to achieve maximum usage and minimum delays? Many major airports have most, if not all, parallel runways. Examples ...
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### How are go-arounds safe with close parallel runways?

Some airports operate simultaneous take off and landing on parallel but close runways. By close, I mean like the pairs of runways at LAX. What if a landing aircraft makes a go-around at the same time ...
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