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Odd behavior of slats at 6.0 degrees AoA


FishBike

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While doing some landing practice today, I noticed that at exactly 6.0 degrees angle of attack, the slats repeatedly deploy and retract. This was at around 250 knots in level flight, though it happened at progressively lower speeds as I used up fuel. To reproduce the issue, slow down until your alpha reads 5.9 and then continue a gradual speed reduction. As your alpha passes through 6.0, watch the leading edge of the wings and you'll see the slats shaking up and down. It stops before alpha reads 6.1. Speeding up through the problem airspeed also shows the issue. I'm pretty sure that's not supposed to happen!

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