Shutter door mechanism for wing leading edge slat cut-outs

1. An aircraft wing comprising:

a wing leading edge;

a cut-out opening in the wing leading edge; and

a shutter mechanism to close the cut-out opening when a wing leading edge slat is moved from a retracted condition to a deployed condition thereof, wherein the shutter mechanism comprises:

(i) a shutter door sized and configured to substantially close the cut-out opening when moved from a retracted position to an extended position thereof;

(ii) a linkage assembly comprising a support shaft and having an upper end pivotally connected to the shutter door and a lower end connected to the support shaft for rotational movements about a pivot axis defined by the support shaft; and

(iii) a torsion spring assembly operatively connected to the support shaft and exerting a bias force on the linkage assembly in a direction to move the shutter door from the retracted position thereof and into the extended position thereof.

2. The aircraft wing according to claim 1 , wherein the linkage assembly includes multiple link bars operatively interconnected to one another.

3. The aircraft wing according to claim 2 , wherein the multiple link bars comprise a drive link bar fixed at one end to the support shaft so as to be rotatable about the pivot axis thereof and an opposite end pivotally connected at a forward connection point of the shutter door.

4. The aircraft wing according to claim 3 , wherein the multiple link bars comprise first and second link bars each having upper and lower ends, wherein (i) the upper end of the first link bar and the lower end of the second link bar are rigidly fixed to one another, (ii) the lower end of the first link bar is pivotally connected to the wing leading edge, and (iii) the upper end of the second link bar is pivotally connected to an aft connection point of the shutter door.

5. The aircraft wing according to claim 1 , wherein the shutter mechanism comprises:

a spaced-apart pair of linkage assemblies, each linkage assembly including multiple link bars operatively interconnected to a respective side of the shutter door and having oppositely oriented support shafts, and wherein each linkage assembly includes an upper end pivotally connected to a respective side of the shutter door and a lower end connected to a respective support shaft for rotational movements about a pivot axis defined by the support shaft; and

a pair of oppositely oriented torsion spring assemblies operatively connected to the respective support shaft and exerting a bias force on a respective one of the linkage assemblies in a direction to move the shutter door from the retracted position thereof and into the extended position thereof.

6. The aircraft wing according to claim 5 , wherein each of the multiple link bars comprises a drive link bar fixed at one end to the support shaft so as to be rotatable about the pivot axis thereof and an opposite end pivotally connected at a forward connection point of the shutter door at a respective side thereof.

7. The aircraft wing according to claim 6 , wherein each of the multiple link bars comprise first and second link bars each having upper and lower ends, wherein (i) the upper end of the first link bar and the lower end of the second link bar are rigidly fixed to one another, (ii) the lower end of the first link bar is pivotally connected to the wing leading edge, and (iii) the upper end of the second link bar is pivotally connected to an aft connection point of the shutter door.

8. The aircraft wing according to claim 1 , wherein the torsion spring assembly includes a fixed link attached to a wing rib of the wing leading edge and a torsion spring having one end fixed to the support shaft and another end fixed to the fixed link.

9. The aircraft wing according to claim 1 , wherein the shutter mechanism further comprises:

a pair of spaced-apart sliding trail guides positionally fixed to the wing leading edge; and

a pair of oppositely oriented outwardly protruding slide pins carried by the shutter door and slideably engaged with a respective one of the trail guides.

10. The aircraft wing according to claim 9 , wherein the linkage assembly comprises:

a pair of spaced-apart link bars;

a pair of oppositely oriented support shafts, wherein an upper end of each link bar is rotatably attached to a respective forward connection point of the shutter door and a lower end of each link bar is fixed to a respective one of the support shafts; and

a pair of oppositely oriented torsion spring assemblies each being operatively connected to the respective one of the support shafts and exerting a bias force on the link bars in a direction to move the shutter door from the retracted position thereof and into the extended position thereof.

11. The aircraft wing according to claim 9 , wherein the shutter mechanism comprises:

a spaced-apart pair of linkage assemblies, each linkage assembly including multiple link bars operatively interconnected to a respective side of the shutter door and having oppositely oriented support shafts, and wherein each linkage assembly includes an upper end pivotally connected to a respective side of the shutter door and a lower end connected to a respective support shaft for rotational movements about a pivot axis defined by the support shaft;

a pair of oppositely oriented torsion spring assemblies operatively connected to the respective support shaft and exerting a bias force on a respective one of the linkage assemblies in a direction to move the shutter door from the retracted position thereof and into the extended position thereof.

12. The aircraft wing according to claim 11 , wherein each of the torsion spring assemblies includes a fixed link attached to a wing rib of the wing leading edge and a torsion spring having one end fixed to the support shaft and another end fixed to the fixed link.

13. An aircraft which comprises the aircraft wing according to claim 1 .

14. An aircraft which comprises the aircraft wing according to claim 10 .