Actuation system for leading edge high-lift device
An actuation system configured to deploy a high-lift device on a leading edge of an aircraft wing. The system comprises: a link pivotally connected to the wing at a first pivot point and to the high-lift device at a second pivot point; a first actuation mechanism configured to rotate the high-lift device about the first pivot point; and a second actuation mechanism configured to rotate the high-lift device about the second pivot point. The second actuation mechanism is operable independently of the first actuation mechanism, and can be operated in order to generate a sealing force between the high-lift device and the leading edge of the aircraft wing.
1. An actuation system configured to deploy a high-lift device on a leading edge of an aircraft wing, the system comprising:
a. a link pivotally connected to the wing at a first pivot point and to the high-lift device at a second pivot point;
b. a first actuation mechanism configured to rotate the high-lift device about the first pivot point in order to move the high-lift device downward around the leading edge from a stowage position to an intermediate position; and
c. a second actuation mechanism configured to rotate the high-lift device about the second pivot point,
wherein the second actuation mechanism is configured to operate independently of said first actuation mechanism when the high-lift device is in both the stowage position and the intermediate position, to generate a sealing force between the high-lift device and the leading edge of the aircraft wing, and is configured to release said sealing force to move the high-lift device from the intermediate position to a fully extended position, said fully extended position including a slot between said high-lift device and said leading edge of said wing.
2. The system of claim 1 wherein the first actuation system comprises a first actuator having a first control input for receiving a first control signal; and the second actuation system comprises a second actuator having a second control input for receiving a second control signal.
3. The system of claim 1 wherein the second actuation mechanism is configured to move the high-lift device in a first direction from the intermediate position to the fully extended position, and to move the high-lift device in a second direction to generate a sealing force between the high-lift device and the leading edge of the aircraft wing.
4. The system of claim 1 wherein the second actuation mechanism is pivotally connected to the link or the wing, and pivotally connected to the high-lift device.
5. The system of claim 1 wherein the first pivot point is below the second pivot point in at least one position of the high-lift device.
6. The system of claim 1 , wherein the system is configured to rotate the high-lift device at least about the first pivot point in order to move the high-lift device from a stowage position to an intermediate position in which the high-lift device engages the leading edge of the aircraft wing; and further configured to rotate the high-lift device at least about the second pivot point in order to move the high-lift device from the intermediate position to a fully extended position.
7. A method of deploying a high-lift device on a leading edge of an aircraft wing, using the actuation system of claim 1 , the method comprising the steps of:
a. rotating the high-lift device about the first pivot point by operation of said at least a first actuation mechanism in order to move the high-lift device downward around the leading edge from said stowage position to said intermediate position and providing a sealing force between the high-lift device and the leading edge by operation of said at least a second actuation mechanism in both said stowage position and said intermediate position;
b. rotating the high-lift device about the second pivot point by operation of said at least a second actuation mechanism releasing said sealing force and moving the high-lift device from the intermediate position to said fully extended position creating said slot.
8. The method of claim 7 wherein the second actuation mechanism is operated in a first direction in order to move the high-lift device from the intermediate position to a fully extended position, and in a second direction in order to generate a sealing force between the high-lift device and the leading edge of the aircraft wing.
9. The method of claim 7 further comprising the step of operating the first actuation mechanism simultaneously with the second actuation mechanism.
10. The method of claim 7 further comprising the step of allowing air to flow through the slot and exit onto an upper surface of the wing when the high-lift device is in the fully extended position.
11. The method of claim 7 further comprising the step of operating the second actuation mechanism in order to press the high-lift device against the leading edge of the aircraft wing as it moves downward around the leading edge from the stowage position to the intermediate position.
12. An actuation system according to claim 1 , wherein the high-lift device forms a leading edge contour of the wing when in said stowage position.