What you circled is the fairing that covers the arms that hold and move the flaps.
Alex. I found this guide which might be of some help. http://www.airlinercafe.com/page.php?id=396
It has a nice close-up photo of that pressure relief vent you were discussing in another topic.
Alex,
The parts you have circled are called canoes. They contain the tracks the flaps move on.
This type of flaps are called Fowler flaps. A Google search should help you.
cheers,
Joe
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After reading a bit, and looking more closely at pictures, I believe I miss-spoke when I said the MD-80's have Fowler flaps. It looks like they have hinged flaps. This document might be interesting also,- http://www.boeing.com/commercial/airpor ... s/md80.pdf
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