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A high-lift system on the wing of an aircraft and a method for its operation are described. High-lift flaps (2) which are arranged on the wing (1) are extended from a retracted position in order to increase the lift, and a slot (3) through which flow passes from the lower face to the upper face of t

A high-lift system on the wing of an aircraft and a method for its operation are described. High-lift flaps (2) which are arranged on the wing (1) are extended from a retracted position in order to increase the lift, and a slot (3) through which flow passes from the lower face to the upper face of the wing (1) is opened (advanced slat/flap-gap control). According to the invention, the slot (3) through which flow passes is opened independently of the position of the high-lift flap (2). This makes it possible to selectively achieve a better maximum coefficient of lift (CL) or a better lift-to-drag ratio with less noise being produced.

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1. A high-lift system for being disposed on the wing of an aircraft, the high-lift system comprising: a leading edge slat movably arranged on the wing and being a foremost flap of the high lift system with a front edge being oriented opposed to a predetermined airflow which is directed to the wing f

1. A high-lift system for being disposed on the wing of an aircraft, the high-lift system comprising: a leading edge slat movably arranged on the wing and being a foremost flap of the high lift system with a front edge being oriented opposed to a predetermined airflow which is directed to the wing for producing a lift force and with a rear edge lying opposed to the front edge and facing the wing,a flap kinematics for moving the leading edge slat between a retracted position and different extended positions for increasing lift, in which positions, a slot between the rear edge of the leading edge slat and the wing is in a closed state in which flow between the leading edge slat and the wing is hindered or effectively hindered, anda slot opening and closing device movably connected to the leading edge slat, by which the leading edge slat or a rear part of the leading edge slat, which comprises the rear edge of the slat, is rotatable or tiltable about an axis which runs in the wingspan direction such that in an extended position of the leading edge slat,independently of the position of the leading edge slat, the rear edge is movable from the closed state to an opened state, in which, through the slot, flow passes from the lower face to the upper face of the wing when the predetermined airflow is directed to the wing and thereafter movable again to a closed state. 2. The high-lift system as claimed in claim 1, the rear part of the leading edge slat is formed by a miniflap provided within the slot. 3. The high-lift system as claimed in claim 1, wherein the flap kinematics is designed such that the slot is opened or closed by translational or rotary movement of a suspension for rails to which the leading edge slat is fitted, or by movement of components of said suspension. 4. The high-lift system as claimed in claim 1, wherein the high-lift system comprises an actuation device for actuation of the slot opening and closing device, so that the slot opening and closing device is actuable independently of the position of the leading edge slat. 5. The high-lift system as claimed in claim 4, wherein the actuation device is operated by a motor or motors. 6. The high-lift system as claimed in claim 4, wherein the actuation device is operated by spring force or elastic component deformation. 7. The high-lift system as claimed in claim 1, wherein the operating device is designed such that the slot through which flow passes is opened by aerodynamic forces. 8. The high-lift system as claimed in claim 6, wherein the operating device is intended to open the slot in response to an externally supplied signal, and to the close the slot by a motor or motors. 9. The high-lift system as claimed in claim 1, wherein the high-lift system comprises a control device which is configured to command the actuation device for actuation of the slot opening device as a function of the angle of attack or speed, or as a function of a parameter which is equivalent to the angle of attack or the speed. 10. The high-lift system as claimed in claim 9, wherein the control device is designed to command the actuation device for actuation of the slot opening and closing device such that the slot is kept closed until a predetermined angle of attack (αprot) is reached and is opened on reaching or exceeding the predetermined angle of attack (αprot), or is kept closed until a predetermined speed (Vprot) is reached, and is opened on reaching or undershooting the predetermined speed (Vprot). 11. The high-lift system as claimed in claim 1, wherein the high-lift system comprises an operating device with a control device and actuation devices, wherein the control device is connected by a first command line to a first actuation device for driving the leading edge slat and with a second command line to a second actuation device for driving the slot opening and closing device, the control device comprising a function for generating a signal for actuation of the first actuation device and for generating a signal for actuation of the second actuation device. 12. The high-lift system as claimed in claim 11, wherein the actuation command function comprises an input module for receiving or operational data from an aircraft system device, and in that the command function comprises a function which, based on these input data, calculates positions of the flap and of the slot opening and closing device for transmitting the same to the first actuation device and to the second actuation device. 13. A method for operating a high-lift system on the wing of an aircraft, the high-lift system comprising a leading edge slat as a foremost flap of the high-lift system, the method comprising:moving the leading edge slat as the foremost flap of the high lift system with respect to the wing, the leading edge slat including a front edge being oriented opposed to a predetermined airflow that is directed to the wing for producing a lift force when interacting with the wing and a rear edge facing the wing, between a retracted position and different extended positions, in which positions a slot between a rear edge of the leading edge slat is in a closed state in which flow between the leading edge slat and the wing is effectively hindered, androtating or tilting the leading edge slat or a rear part of the leading edge slat, which comprises the rear edge of the slat and which is movably connected to the leading edge slat, about an axis which runs in the wingspan direction such that, in an extended position of the leading edge slat, the rear edge can be arranged from the closed state to an opened state, in which through the slot flow passes from the lower face to the upper face of the wing when the predetermined airflow is directed to the wing, and thereafter again arranged to a closed state. 14. The method as claimed in claim 13, wherein the slot is open at a speed which is smaller than the speed at which leading edge slat is extended. 15. The method as claimed in claim 13, wherein the slot is opened as a function of the angle of attack or speed, or as a function of a parameter which is equivalent to the angle of attack or the speed. 16. The high-lift system as claimed in claim 10, wherein the slot is kept closed until a predetermined angle of attack(αprot)is reached and is opened on reaching or exceeding the predetermined angle of attack (αprot), or is kept closed until a predetermined speed (Vαprot) is reached, and is opened on reaching or undershooting the predetermined speed (Vαprot). 17. The high-lift system as claimed in claim 1, wherein the high-lift system comprises an operating device which activates the slot opening and closing device in order to open the slot through which flow passes, at a speed which is considerably smaller than the speed at which the leading edge slat is extended.