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This question already has an answer here:

The ailerons of the A380 seem to be in 2 pieces. What is its purpose?enter image description here

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marked as duplicate by fooot, ratchet freak, Federico, DeltaLima, Farhan May 13 '15 at 16:16

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    $\begingroup$ Actually, there are 3 ailerons (not 2). This picture shows them better. You can see the third one in your picture too. $\endgroup$ – Farhan May 13 '15 at 16:16
  • $\begingroup$ What is the purpose of having 3 ailerons? $\endgroup$ – Madhav Sudarshan May 13 '15 at 16:18
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    $\begingroup$ I guess the purpose is discussed in the question linked. If you feel that the other post does not answer your question, please edit yours and specify why this one is different than that one. It will be reopened then. $\endgroup$ – Farhan May 13 '15 at 16:22
  • $\begingroup$ also relevant: aviation.stackexchange.com/a/11337/1467 $\endgroup$ – Federico May 13 '15 at 16:23
  • $\begingroup$ This is a duplicate question but there should not be a need to downvote. $\endgroup$ – Farhan May 14 '15 at 13:22

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