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Have a look at this picture: enter image description here

It's from Airliners.net (though I've modified it a lot) and shows some lines on the fuselage. What are they? Are they Lightning Diverter Strips like in this question ?

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No, they are just the boundaries between skin panels. See below for a picture of the 747-8 fuselage during assembly.

[Boeing 747-8 front from side[1]

Boeing 747-8 front from side (picture source)

And this is how the panels for the cylindrical section look like before they are joined:

Boeing 747-8 panel skins

Boeing 747-8 fuselage panels. The original picture (source) is named "wing panel skins", but these are really fuselage parts.

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These lines are skin laps. The vertical ones do not overlap, the horizontal laps overlap by three rows of fasteners.

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  • $\begingroup$ The downvote wasn't mine but it would probably help if you explained what a "skin lap" is. The asker surely wanted to understand what they are, not just what their name is. $\endgroup$ – David Richerby Aug 23 '16 at 10:22

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