FlyDeltaJets
Topic Author
Posts: 1639
Joined: Thu Feb 02, 2006 4:24 pm

### Runway Numbering

How does the grid numbering system work?
The only valid opinions are those based in facts

Cubsrule
Posts: 12579
Joined: Sat May 15, 2004 12:13 pm

### RE: Runway Numbering

It's easy. Take the compass heading, round to the nearest 10, and lop off a digit. Thus, a runway with a heading of 274 degrees gets rounded to 270, and the runway is 27. Of course, going the other way, the heading is 274-180 or 94 degrees, so the heading going to other way is 9. Left, right, and center (L, R, and C) are simply as you see them, so as you look down the runways, the leftmost one is L. Of course, going the other way, it's right, so if our 274 runway is the leftmost one and is 27L, then the other end is the rightmost, so its 9R.

Where there are more than 3 parallel runways, they are typically numbered in sets. All 5 runways at ATL are parallel, but the north complex is numbered 8-26, the middle 2 are 9-27, and the new runway is 10-28.
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superhub
Posts: 398
Joined: Sat Jan 21, 2006 4:17 pm

### RE: Runway Numbering

 Quoting FlyDeltaJets (Thread starter):How does the grid numbering system work?

What do you mean by grid numbering? Do you mean simply how a number is assigned for a runway? If so, see above post.

Or do you mean earth coordinates?

timz
Posts: 6318
Joined: Fri Sep 17, 1999 7:43 am

### RE: Runway Numbering

And he means magnetic, not true (usually). And magnetic north moves over the years, so here and there runways have changed numbers.

cptspeaking
Posts: 567
Joined: Mon Apr 24, 2006 2:49 pm

### RE: Runway Numbering

 Quoting Timz (Reply 3):so here and there runways have changed numbers

My home airport (KLHZ) where I got my private license just went from 4-22 to 5-23 this past summer while I was working there...
the FAA shut us down for like 4 days so they could patch and paint the runway

...and don't call me Shirley!!

ANCFlyer
Posts: 21391
Joined: Mon Nov 15, 2004 3:51 pm

### RE: Runway Numbering

 Quoting CptSpeaking (Reply 4):My home airport (KLHZ) where I got my private license just went from 4-22 to 5-23 this past summer while I was working there...

As did ANC . . .

6-24 is now 7-25.
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comairguycvg
Posts: 241
Joined: Sun Jan 22, 2006 5:01 pm

### RE: Runway Numbering

 Quoting Superhub (Reply 2):Or do you mean earth coordinates?

LOL!!!!
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fiaz
Posts: 92
Joined: Sat Mar 05, 2005 2:34 pm

### RE: Runway Numbering

heres an easy way called the " take 2 away add 2"

a runway is numbered 23,,,Now whats the obosite of the runway numbered

well take 2 away from 2 = 0 , 3 + 2 = 5 ...there fore runway 05

samething with 33R 3 - 2 = 1 ,,, 3 + 2 = 5 .......therefore runway 15

hope that helps

ramerinianair
Posts: 1452
Joined: Tue Nov 11, 2003 6:03 am

### RE: Runway Numbering

The magnetis deviation is always changing. If you had a runway that was 080 degrees with a +14 deviation, it would be 094 degrees or runway 09. If the deviation changed to +15, then the heading would be 095 or runway 10.
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FlyDeltaJets
Topic Author
Posts: 1639
Joined: Thu Feb 02, 2006 4:24 pm

### RE: Runway Numbering

Ok thanks now I have a little idea of how it works.

 Quoting Superhub (Reply 2):What do you mean by grid numbering?

I got that term from the article about the new runway it ATL. It said that the runways are numbered using a "grid" system.
The only valid opinions are those based in facts

scoliodon
Posts: 212
Joined: Mon Oct 31, 2005 4:15 pm

### RE: Runway Numbering

 Quoting Cubsrule (Reply 1):Where there are more than 3 parallel runways, they are typically numbered in sets. All 5 runways at ATL are parallel, but the north complex is numbered 8-26, the middle 2 are 9-27, and the new runway is 10-28.

Yes, that's the way it works. In DFW there is a set of 18L(36R),18R(36L) and another set of 17L(35R),17C(35C),17R(35L).

As pointed out by other replies this heading is only the magnetic heading and not the true one.
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alphafloor
Posts: 1265
Joined: Tue Jun 08, 2004 12:36 am

### RE: Runway Numbering

 Quoting Fiaz (Reply 7):heres an easy way called the " take 2 away add 2" a runway is numbered 23,,,Now whats the obosite of the runway numbered well take 2 away from 2 = 0 , 3 + 2 = 5 ...there fore runway 05 samething with 33R 3 - 2 = 1 ,,, 3 + 2 = 5 .......therefore runway 15 hope that helps

Interesting, didn't know this before. But this rule only works with rwys from 20 up to 36. For rwys from 01 up to 19 take you must inverse the rule 'add 2 and take 2 away', isn'it ? eg. rwy 16 add 2 to 1= 3 and take 2 to 6= 4 =>rwy 34.

...
Whatever

alphafloor
Posts: 1265
Joined: Tue Jun 08, 2004 12:36 am

### RE: Runway Numbering

... errr.. and rwy 19 ? = rwy 37 ?????
and rwy 01 ???

[Edited 2006-05-19 09:38:15]
Whatever

Boeing747_600
Posts: 605
Joined: Tue Oct 19, 1999 4:01 am

### RE: Runway Numbering

 Quoting Alphafloor (Reply 11):Interesting, didn't know this before. But this rule only works with rwys from 20 up to 36. For rwys from 01 up to 19 take you must inverse the rule 'add 2 and take 2 away', isn'it ? eg. rwy 16 add 2 to 1= 3 and take 2 to 6= 4 =>rwy 34.

A much simpler (and much more logical) rule would be to add 18 if the runway number is less than or equal to 18 and subtract 18 otherwise.

18 comes from the fact that the reciprocal direction is 180 degrees from the direction of the runway number in question.

Olympus69
Posts: 1571
Joined: Sat Jun 15, 2002 11:21 pm

### RE: Runway Numbering

 Quoting Boeing747_600 (Reply 13):A much simpler (and much more logical) rule would be to add 18 if the runway number is less than or equal to 18 and subtract 18 otherwise.

This works well for normal people, but for the average A.netter a pencil and paper would be required.

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