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For questions about those devices that swing forwards and downwards from the leading edge of an aircraft's wings, allowing them to produce more lift without stalling. Questions about high-lift devices in general should use "high-lift-devices" instead.

13 votes
3 answers
2k views

Why are the outboard Krueger Flaps retracted before the others on the B747?

In this video, I noticed that the outboard Krueger Flaps on this Boeing 747 were retracted while the middle and inner sets remained extended (refer to 3:22 - 3:30 in the video). My questions are: W …
pr1268's user avatar
  • 1,955
9 votes
2 answers
2k views

Why such a small Krueger flap on 777-300?

Why is there such a small Krueger flap just inboard of the engine pylon on the Boeing 777-300, when the rest of the wing (including the further-inboard section of the wing) has leading edge slats? …
pr1268's user avatar
  • 1,955