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How many Krueger flaps does the 737-700 have? It has inboard krueger flaps, but I'm trying to make out if it has one or two.

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It has 4 Krueger flaps (2 on each wing) and 8 slats (4 on each wing):

LE devices consist of four flaps and eight slats: two flaps inboard and four slats outboard of each engine.

(Boeing 737 NG FCOMv2 9.20.20 - Flight Controls - System Description - Flaps and Slats)

You can see the Krueger flaps in the following image (thanks to ymb1 for the link):

737-800
(cropped from Wikimedia Commons, CC BY-SA 2.0)

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