Leej
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Joined: Fri Apr 20, 2001 10:39 pm

LGW Runway Markings

Wed Mar 27, 2013 9:03 pm

Okay I've had a search on the net and can't find an answer -Wiki not my friend, nor CAA etc charts. On 26L/08R, there are small markings that look like / // // one way and the other - space about 100m apart. I thought they might be some visual countdown clues to distance before taxiway exit. But they don't seem to match up. Visible easily on Google earth, and I saw them the other week when flying out/in. Any ideas? They are off set to the north of the runway centreline. Haven't seen them at LHR.
Ta!

[Edited 2013-03-27 14:22:26]
 
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TupolevTu154
Posts: 1931
Joined: Fri Aug 27, 2004 6:00 pm

RE: LGW Runway Markings

Wed Mar 27, 2013 9:14 pm

I've often seen these and wondered too. All the pilots I know don't seem to know either.

For the benefit of those wanting to see them, take a look here: http://goo.gl/maps/qSr7g

Quoting Leej (Thread starter):
I thought they might be some visual countdown cluse to distance before taxiway exit.

This was my assumption too!

On closer inspection, they seem to count down to the very center of the runway.

[Edited 2013-03-27 14:19:49]
 
Leej
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RE: LGW Runway Markings

Wed Mar 27, 2013 9:35 pm

Cheers Mr TU154
I thought that about the centre - but you'll also notice they are at the end of 26L too, before the last high speed turnoff. But the last / in that direction is more than 100m to the turnoff. Can't see them at the start end 26L as too much rubber maybe obscuring them. If they are 100m visual countdowns they seem a little vague. Sure somebody will know!
 
vikkyvik
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RE: LGW Runway Markings

Wed Mar 27, 2013 10:13 pm

I don't know this for sure, but they've always appeared to be "countdown" markers to high-speed exit taxiways.
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oly720man
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RE: LGW Runway Markings

Thu Mar 28, 2013 9:35 am

Since they are 100m apart could they be touchdown, midpoint and stop end RVR markings for ground checking of distance?
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Starlionblue
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RE: LGW Runway Markings

Thu Mar 28, 2013 9:53 am

Quoting oly720man (Reply 4):

Since they are 100m apart could they be touchdown, midpoint and stop end RVR markings for ground checking of distance?

The sensors don't need them so that seems unlikely.
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LHRjc
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RE: LGW Runway Markings

Thu Mar 28, 2013 4:40 pm

They are countdown markers to the high speed exits that we use if LVP's (Low Visibility Procedures) are in force. They are lit at night or in LVP's too.
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LHRjc
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RE: LGW Runway Markings

Thu Mar 28, 2013 4:52 pm

From the AIP (to do with the lighting in those same markings):-

Rapid Exit Taxiway Indicator Lights (RETILs) installed on the first and second Rapid Exit Taxiways (RETs) for Runway 08R/26L. They provide a 3-2-1 countdown pattern of yellow lights to enable pilots to locate the nearest RET and apply braking action for a more efficient roll-out and runway exit speed.
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LHRjc
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RE: LGW Runway Markings

Mon Apr 01, 2013 3:09 pm

Just got back from ALC and noticed since the runway's been resurfaced they now have the same markings on runway 10 there.
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