A handful use such a setting for ground use only, known as "lift dump" in the world of Hawker business jets, to shorten their landing distance.
A BLC system is essentially a bleed-air system that ducts high-pressure air ovr the srfc of an an wing and/or flaps to increase lift
So an airplane with a 90° flap setting must exhibit ,some very interesting flight characteristics.A 90° flap setting is indeed extreme, and very few aircraft have flaps that extend to such an angle.
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