Claim The trailing edge of the main wing is composed of a flap 4 movable around an axis 3. A lever 5 is rigidly connected with the flap. A crosshead engaged in a slotted guide member 7. If this is moved in the direction of the arrow P from the cockpit, the position of the crosshead running in an inclined groove or a slot is altered. The result of this is that the lever 5 rotates around 3 and thus displaces the flap 4.
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