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 Runway Numbering
 FlyDeltaJets From United States of America, joined Feb 2006, 1989 posts, RR: 2Posted Fri May 19 2006 03:21:16 UTC (10 years 1 week 6 days 1 hour ago) and read 3343 times:

 How does the grid numbering system work?
 The only valid opinions are those based in facts
 Cubsrule From United States of America, joined May 2004, 24552 posts, RR: 22 Reply 1, posted Fri May 19 2006 03:31:55 UTC (10 years 1 week 6 days 1 hour ago) and read 3328 times:

 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.
 I can't decide whether I miss the tulip or the bowling shoe more
 Superhub From Hong Kong, joined Jan 2006, 480 posts, RR: 0 Reply 2, posted Fri May 19 2006 04:04:47 UTC (10 years 1 week 6 days ago) and read 3281 times:

 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 From United States of America, joined Sep 1999, 7228 posts, RR: 7 Reply 3, posted Fri May 19 2006 04:15:30 UTC (10 years 1 week 6 days ago) and read 3253 times:

 Quoting Cubsrule (Reply 1):Take the compass heading,

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

 CptSpeaking From United States of America, joined Apr 2006, 639 posts, RR: 1 Reply 4, posted Fri May 19 2006 04:25:56 UTC (10 years 1 week 6 days ago) and read 3234 times:

 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 From , joined Dec 1969, posts, RR: Reply 5, posted Fri May 19 2006 04:50:45 UTC (10 years 1 week 6 days ago) and read 3197 times:

 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.

 ComairGuyCVG From United States of America, joined Jan 2006, 357 posts, RR: 1 Reply 6, posted Fri May 19 2006 05:36:46 UTC (10 years 1 week 5 days 23 hours ago) and read 3148 times:

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

LOL!!!!

 Worked at: CV62, RJTA, KNLC, CV63, KNFL, OKAJ, KTRI, CV67, KMGE, KNQX, KVPS, KPIT, KCVG, KTYS, KATL
 Fiaz From Canada, joined Mar 2005, 95 posts, RR: 0 Reply 7, posted Fri May 19 2006 06:03:29 UTC (10 years 1 week 5 days 22 hours ago) and read 3119 times:

 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 From United States of America, joined Nov 2003, 1489 posts, RR: 0 Reply 8, posted Fri May 19 2006 06:24:46 UTC (10 years 1 week 5 days 22 hours ago) and read 3096 times:

 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. SR
 W N = my Worst Nightmare!!!!!
 FlyDeltaJets From United States of America, joined Feb 2006, 1989 posts, RR: 2 Reply 9, posted Fri May 19 2006 09:05:38 UTC (10 years 1 week 5 days 19 hours ago) and read 3025 times:

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 From India, joined Oct 2005, 217 posts, RR: 0 Reply 10, posted Fri May 19 2006 09:23:04 UTC (10 years 1 week 5 days 19 hours ago) and read 3004 times:

 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.

 JFK-LGA-EWR-DTW-IND-PHX-CLE-SFO-LAS-SEA-ORD-MCO-MIA-DFW-ATL-CDG-FRA-BOM-MAA-DEL-TRZ-DXB-CLT-CVG-DEN-MSP
 Alphafloor From Chile, joined Jun 2004, 1277 posts, RR: 35 Reply 11, posted Fri May 19 2006 09:34:28 UTC (10 years 1 week 5 days 19 hours ago) and read 2988 times:

 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 From Chile, joined Jun 2004, 1277 posts, RR: 35 Reply 12, posted Fri May 19 2006 09:36:28 UTC (10 years 1 week 5 days 19 hours ago) and read 2979 times:

 ... errr.. and rwy 19 ? = rwy 37 ????? and rwy 01 ???[Edited 2006-05-19 09:38:15]
 Whatever
 Boeing747_600 From United States of America, joined Oct 1999, 1304 posts, RR: 0 Reply 13, posted Fri May 19 2006 17:52:17 UTC (10 years 1 week 5 days 11 hours ago) and read 2830 times:

 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 From Canada, joined Jun 2002, 1737 posts, RR: 7 Reply 14, posted Fri May 19 2006 21:37:14 UTC (10 years 1 week 5 days 7 hours ago) and read 2723 times:

 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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