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Old 04-28-2009, 05:08 PM   #1
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Boeing 777-300ER question

Apologies if this sounds like a stupid question. I've always wondered what these two black lines on the wings of the 777-300er are for:



If anyone has any idea please feel free to post here.
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Old 04-28-2009, 05:33 PM   #2
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Re: Boeing 777-300ER question

Not too sure, but they could be quite similar to the Speed Strips that used to be on TWA Aircraft.

Further information on these can be found in here, dylan made a great post describing what they do.
http://www.wings900.com/vb/general-s...pes-wings.html

They also were said to work well to help identify Icing easily. Which if not this (speed Strips), then that could be their only purpose.
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Old 04-28-2009, 05:33 PM   #3
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Re: Boeing 777-300ER question

im not 100% on this but i think there ment to be ice warning lines, i dont know how they work but thats what i was told, hope this helps
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Old 04-28-2009, 07:28 PM   #4
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Re: Boeing 777-300ER question

Quote:
Originally Posted by LOT 737-300 View Post
Not too sure, but they could be quite similar to the Speed Strips that used to be on TWA Aircraft.

Further information on these can be found in here, dylan made a great post describing what they do.
http://www.wings900.com/vb/general-s...pes-wings.html

They also were said to work well to help identify Icing easily. Which if not this (speed Strips), then that could be their only purpose.
Thanks for your help. Any ideas why they're just used on the 777-300ER and not any other boeing aircraft? I believe that the 777-200LR & 777F both use the same wing as the 777-300er with the same span but there are no black lines on those wings??
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Old 04-28-2009, 07:58 PM   #5
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Re: Boeing 777-300ER question

Quote:
Originally Posted by speedbird380super View Post
Thanks for your help. Any ideas why they're just used on the 777-300ER and not any other boeing aircraft? I believe that the 777-200LR & 777F both use the same wing as the 777-300er with the same span but there are no black lines on those wings??
Besides the B77W, I found only one Airline who had this stripes on their planes. The 200ER.

After searching for the stripes on other Boeing 777 series, No stripes on -LR or the -F was found.
JAL B777-200ER


JAL B777-200ER


Hope this helps.
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Old 04-28-2009, 09:46 PM   #6
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Re: Boeing 777-300ER question

Quote:
Originally Posted by speedbird380super View Post
Thanks for your help. Any ideas why they're just used on the 777-300ER and not any other boeing aircraft? I believe that the 777-200LR & 777F both use the same wing as the 777-300er with the same span but there are no black lines on those wings??
Well, I believe that is because that is applied per Airline's discretion (like TWA used them on all of their aircraft pretty much.) They're not exactly put there by Boeing but by the airline themselves I would imagine.
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Old 04-29-2009, 12:59 PM   #7
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Re: Boeing 777-300ER question

Quote:
Originally Posted by Rex View Post
Besides the B77W, I found only one Airline who had this stripes on their planes. The 200ER.

After searching for the stripes on other Boeing 777 series, No stripes on -LR or the -F was found.
JAL B777-200ER


JAL B777-200ER


Hope this helps.
thanks for the info. i didn't know -200ers had stripes as well.
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Old 04-29-2009, 01:04 PM   #8
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Re: Boeing 777-300ER question

Quote:
Originally Posted by LOT 737-300 View Post
Well, I believe that is because that is applied per Airline's discretion (like TWA used them on all of their aircraft pretty much.) They're not exactly put there by Boeing but by the airline themselves I would imagine.
thanks for your help. it's just that i've noticed that most if not all of the 777-300er operators have the black stripes. Could it be that boeing is putting it on when the aircraft is manufactured? i doubt that some of the airlines would waste money putting it on themselves.
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Old 04-29-2009, 01:12 PM   #9
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Re: Boeing 777-300ER question

They are used to help pilots line up with the runway when using the tail camera.
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Old 04-29-2009, 05:16 PM   #10
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Re: Boeing 777-300ER question

Quote:
Originally Posted by speedbird380super View Post
thanks for your help. it's just that i've noticed that most if not all of the 777-300er operators have the black stripes. Could it be that boeing is putting it on when the aircraft is manufactured? i doubt that some of the airlines would waste money putting it on themselves.
If airlines are willing to "waste" money to retrofit Winglet sets onto their aircraft, they will put them on their aircraft if they see it helps the economics of their aircraft. Just like TWA and their speed strips.

But it could be the "tail camera" aide, though I do have my doubts.
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Old 04-30-2009, 12:07 AM   #11
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Re: Boeing 777-300ER question

The 2 black stripes is to tell the pilots where the outward landing gears locations are from the top / tail camera view:

Photos: Boeing 777-312 Aircraft Pictures | Airliners.net



One of the main reasons for that is while they are making any shape turn (like more than 90 degrees) during taxing, they want to make sure its wheels don't run over the grass area.

The 2 black stripes were became a standard painted by Boeing in 773 & 773ER, however, some carriers like ANA & JAL, they painted these 2 black stripes in 744 & 772 too as they had installed the extra cameras on 772 & 744 while other carriers didn't, here are some of the photos from my HND & NRT spotting for your reference.

http://www.wings900.com/vb/spotting/...pr-2009-a.html





http://www.wings900.com/vb/spotting/...pr-2009-a.html



The black stripe right above its landing gear:


The left rear wing camera:
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