Topic Author
Posts: 6673
Joined: Wed Mar 22, 2000 12:26 pm

Numbering Parallel Runways

Mon Feb 12, 2001 12:53 pm

Given that runways are numbered according to compass heading, 0/36 being due north, 9 being due east, 18 being due south, and 27 being due west.

I've noticed that there's a system of assigning L, R, and C to three parallel runways.

However, in cases of four or more parallel runways (i.e. at DFW) there's a problem so one pair of runways is numbered one degree higher/lower.

Lately, though, I've noticed yet another way that this is handled -- the two longest runways are marked as parallels and the shorter is assigned a different number. For example, at PHL three runways are parallel (except for a 0.1-degree difference). The two longer runways are marked 9L/27R and 9R/27L, while the shorter runway is marked 8/26.

The proposed third runway at CLE is marked the same way as PHL's -- although it appears to be parallel to the 5/23 parallels, it is marked as 6/24.

Why are PHL's runways not marked 9R/27L, 9C/27C, and 9L/27R?

Can someone explain the logic of this to me?

Up, up and away!
Posts: 1960
Joined: Tue Feb 06, 2001 5:56 pm

RE: Numbering Parallel Runways

Mon Feb 12, 2001 3:55 pm

afaik it is just a recommendation to designate a runway by compass heading + (L/C/R), not a rule, so in case of , say 4 parallel runway you can have 7R, 8R, 7L, 8L, this is used all over the world...
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

RE: Numbering Parallel Runways

Mon Feb 12, 2001 10:13 pm

There are ICAO recommended practices that determine how successive parallel runways are numbered. (Someone else can chase down the actual convention!)

One thing that precludes a "C" designation is the distance between it and the "L", "R" parallels. Toronto is preparing to build yet a sixth runway upon completion of its fifth runway. The north (currently) single parallel had its designation changed from 24R/06L to 23/05 as the south runways are to be designated 24 L & R/06 R & L. Eventually, the north parallels will be designated 23 L & R/05 R & L.

Those of us who use the airport a lot feel all the additional runways that have been built or are about to be built would more properly be designated as very wide, expensive, well-lit taxiways.

Thanks GTAA.

Best Regards,


RE: Numbering Parallel Runways

Thu Feb 15, 2001 3:12 am

At Frankfurt (EDDF) they have two runway designations for the same piece of runway. The two parallel runways are 25L/R 07L/R, with a magnetic track of 250/070.
On runway 25L they made a High Approach Landing System, which offers the possibility to reduce wake turbulence separation for medium and light aircraft to the permissible radar separation minima. For this purpose they made a second threshold 1500m down runway 25L. This threshold is designated 26L, and there is also an ILS and papi for this threshold. So the approaches ILS DME Rwy 26L and ILS Rwy 25L is for the same strip of runway.
I don't know how much they use it though. I never go to Frankfurt, just saw it in the Jeppesen.

Regards \BEW

Who is online

Users browsing this forum: No registered users and 17 guests

Popular Searches On

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos