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There's a little hole on the leading edge of the vertical stabilizer of this plane:

enter image description here

What is that? What is its purpose?
Thanks
Source: Airliners.net

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That is the ram air intake for the air conditioning packs.

enter image description here

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    $\begingroup$ At first I thought it might be the APU intake, but other sites say that the APU intake is near the bottom rear of the fuselage. $\endgroup$
    – BillDOe
    Commented Mar 13, 2017 at 22:21

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