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TOPIC: Double Threshold Lights

Double Threshold Lights 14 Mar 2019 08:31 #1

  • jpfive
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Anybody got any information regarding lighting consisting of double threshold lights.
I. E. 11 lights and 11 lights. The light fittings were holophane LR23. Era 1959s 1960s. Adsing to this 4 sodiums fodr wingbar were installed.

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Double Threshold Lights 14 Mar 2019 08:53 #2

  • TerryClark
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Where the threshold lights are at the end of the paved surface, they are often bi-directional showing green in the landng direction and red in the opposite direction; is this what you mean?
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Double Threshold Lights 14 Mar 2019 10:31 #3

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Yes but lights are omnidirectional. There are 11 at the threshold followed by transformer pit and then again 11 omnidirectional fittings. I know there were omnidirectional because the fitting casting shows LR23/B.

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Double Threshold Lights 14 Mar 2019 11:37 #4

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Are we discussing a particular airfield? Many of the disused sites I've visited which were active in the fifties and sixties exhibit significantly different runway lighting. Bovingdon, East Kirkby, Elvington and Hemswell spring immediately to mind. The word consistency seemed to have dropped from the English Language for the duration.
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite :twisted:
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Double Threshold Lights 14 Mar 2019 12:20 #5

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Maybe this will help. Airfield was used by RNAS USAF RAF NATO. HAL FAR airfield.

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Double Threshold Lights 14 Mar 2019 12:42 #6

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Edge lights spacing from threshold. First one 45m rest 60m.Wher can i find a publication of airfield requirements in those years.

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Double Threshold Lights 15 Mar 2019 14:44 #7

  • TerryClark
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jpfive wrote: Yes but lights are omnidirectional. There are 11 at the threshold followed by transformer pit and then again 11 omnidirectional fittings. I know there were omnidirectional because the fitting casting shows LR23/B.


Flush fitting threshold lighting is never 'omni directional'; it is always uni-directional showing only to an aircraft on final approach.
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Double Threshold Lights 15 Mar 2019 14:47 #8

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The fittings installed were omni directional both rows. Can it be they had filters to block the light in 1 direction.

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Double Threshold Lights 15 Mar 2019 14:49 #9

  • TerryClark
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jpfive wrote: Edge lights spacing from threshold. First one 45m rest 60m.Wher can i find a publication of airfield requirements in those years.

Normal raised edge light spacing on a British military airfield is uni directional every 30m and co located omni directional every 90m.
Civil airfields usually have raised edge lights every 60m which are in a single unit giving a bi-directional high intensity output and a low intensity omni directional output.

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Double Threshold Lights 15 Mar 2019 14:56 #10

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jpfive wrote: The fittings installed were omni directional both rows. Can it be they had filters to block the light in 1 direction.

I suppose it's possible, but what would be the point in having an omni directional light then 'blocking' the output through most of the visible arc?(Unless they didn't have uni directional available but had a surplus of omnis')

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