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I am wondering about the purpose of the panel marked with the number 156 in this picture: Tsfdoshis

The same black panel can be seen on the wingtips here: wingtip panel

And also here: i.stack.imgur.com/EUZU7.jpgwingtip panel

What purpose does this panel serve? It could be just a construction technique, but in that case why would they cut a hole in the larger panel just to cover it up with the smaller black one?

I am wondering about the purpose of the panel marked with the number 156 in this picture: Tsfdoshis

The same black panel can be seen on the wingtips here: wingtip panel

And also here: i.stack.imgur.com/EUZU7.jpg

What purpose does this panel serve? It could be just a construction technique, but in that case why would they cut a hole in the larger panel just to cover it up with the smaller black one?

I am wondering about the purpose of the panel marked with the number 156 in this picture: Tsfdoshis

The same black panel can be seen on the wingtips here: wingtip panel

And also here: wingtip panel

What purpose does this panel serve? It could be just a construction technique, but in that case why would they cut a hole in the larger panel just to cover it up with the smaller black one?

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