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NYPECO
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Yellow Line on C-17?

Thu Jul 07, 2016 8:06 pm

I just found this picture on wikipedia of three C-17s parked together. Despite being from three different Air Forces, they all have that slanted yellow line under the letters. What is it for?

https://en.wikipedia.org/wiki/File:RAF_RAAF_USAF_C-17s_2007.jpg
 
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7BOEING7
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Re: Yellow Line on C-17?

Thu Jul 07, 2016 9:17 pm

NYPECO wrote:
I just found this picture on wikipedia of three C-17s parked together. Despite being from three different Air Forces, they all have that slanted yellow line under the letters. What is it for?

https://en.wikipedia.org/wiki/File:RAF_RAAF_USAF_C-17s_2007.jpg


Lighting. Also on the winglets and aft fuselage.

https://www.youtube.com/watch?v=KWEY9hbGuWE
 
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N328KF
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Re: Yellow Line on C-17?

Fri Jul 08, 2016 1:55 am

NYPECO wrote:
Despite being from three different Air Forces, they all have that slanted yellow line under the letters. What is it for?


It should be noted that there's very little deviation between the C-17s available to the different services. In fact, I'd say there's greater deviation within the USAF models (eg. the first 71 units versus all the rest) than there is between a foreign-operated airframe and a USAF model of the same age.
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mmo
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Re: Yellow Line on C-17?

Fri Jul 08, 2016 11:41 am

As has been pointed out, it's lighting. More specifically, it's formation lights which allow the other aircraft to triangulate on the lights at night when flying formation, albeit, loose formation. Normally you would have the position and beacon off but the formation lights are dim enough to allow the other aircraft to see them but not bright enough to be seen from any appreciable distance.
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zanl188
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Re: Yellow Line on C-17?

Sat Jul 09, 2016 7:48 am

Indian C-17 at night with the lights on:

http://abingdonboy.tumblr.com/post/9751 ... -loaded-on

Not sure about the C-17, but I know there are C-130 variants where the lights are selectable between visible light & IR. Switch from visible to IR and only somebody with NVGs on can see the lights.
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KC135Hydraulics
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Re: Yellow Line on C-17?

Mon Jul 11, 2016 2:59 pm

As previously mentioned, these are formation lights for use when at night. They're phosphorescent, and they "glow" green when they're lit up. We call them "slime" lights.
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NamGunner
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Re: Yellow Line on C-17?

Tue Jul 12, 2016 1:47 am

I first saw these on F-4D Phantom jets in Vietnam. They were installed in the field, not at a depot.
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Re: Yellow Line on C-17?

Tue Jul 12, 2016 6:03 am

KC135Hydraulics wrote:
They're phosphorescent.


Technically, they are electroluminescent, there's no phosphorescence involved, thankfully. Those lights are a big enough pain in the butt to change without having them full of nasty chemicals.

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