Auxiliary support system for a flap of an aircraft wing

1. An auxiliary support system for a flap coupled to a wing of an aircraft, the auxiliary support system comprising:

a base fixable relative to the wing;

a first track engagement assembly fixed to the base;

a second track engagement assembly fixed to the base; and

a track arm attachable to the flap and comprising a first rail, directly movably engaged with the first track engagement assembly, and a second rail, directly movably engaged with the second track engagement assembly, wherein the first rail is spaced apart from and non-parallel to the second rail, wherein:

the track arm comprises a free end portion and a fixed end portion;

the free end portion is opposite the fixed end portion; the fixed end portion is attachable to the flap; and

the first rail and the second rail diverge away from the fixed end portion such that a distance between an inner surface of the first rail and an inner surface of the second rail is greater at the free end portion than at the fixed end portion.

2. The auxiliary support system according to claim 1 , wherein the first rail and the second rail are non-linear.

3. The auxiliary support system according to claim 1 , wherein:

the first rail of the track arm is slidably engaged with the first track engagement assembly;

the second rail of the track arm is slidably engaged with the second track engagement assembly; and

slidable engagement between the first rail and the first track engagement assembly and between the second rail and the second track engagement assembly keeps the fixed end portion of the track arm within an extension path comprising a linear portion and a curved portion.

4. The auxiliary support system according to claim 1 , wherein each of the first rail and the second rail has a substantially S-shape.

5. The auxiliary support system according to claim 1 , wherein:

the track arm comprises a free end portion and a fixed end portion;

the free end portion is opposite the fixed end portion;

the fixed end portion is attachable to the flap;

the fixed end portion of the track arm comprises a spherical bearing; and

the track arm is attachable to the flap via the spherical bearing.

6. The auxiliary support system according to claim 1 , wherein the first track engagement assembly is horizontally and vertically offset from the second track engagement assembly.

7. The auxiliary support system according to claim 1 , wherein:

each of the first track engagement assembly and the second track engagement assembly comprises a first roller and a second roller;

the first rail of the track arm is interposed between the first roller and the second roller of the first track engagement assembly, wherein the first roller and the second roller of the first track engagement assembly are rollable along the first rail; and

the second rail of the track arm is interposed between the first roller and the second roller of the second track engagement assembly, wherein the first roller and the second roller of the second track engagement assembly are rollable along the second rail.

8. The auxiliary support system according to claim 1 , wherein:

the base comprises two plates spaced-apart from each other; and

the track arm is interposed and movable between the two plates.

9. The auxiliary support system according to claim 8 , further comprising at least one rub pad interposed between one of the two plates and the track arm and at least one rub pad interposed between the other of the two plates and the track arm.

10. An aircraft, comprising:

a body;

a wing coupled to and extending from the body, wherein the wing comprises an outer upper surface and an outer lower surface, the outer upper surface and the outer lower surface defining a loft profile of the wing;

a flap coupled to the wing and extendable from the wing along an extension path comprising a linear portion and a curved portion; and

an auxiliary support system comprising:

a base fixed to the wing within the loft profile of the wing;

a first track engagement assembly fixed to the base;

a second track engagement assembly fixed to the base; and

a track arm attached to the flap and comprising a first rail, directly movably engaged with the first track engagement assembly, and a second rail, directly movably engaged with the second track engagement assembly, wherein the track arm moves along the extension path with the flap and remains within the loft profile of the wing as the flap extends from the wing, wherein:

the track arm comprises a free end portion and a fixed end portion;

the free end portion is opposite the fixed end portion; the fixed end portion is attachable to the flap; and

the first rail and the second rail diverge away from the fixed end portion such that a distance between an inner surface of the first rail and an inner surface of the second rail is greater at the free end portion than at the fixed end portion.

11. The aircraft according to claim 10 , wherein the first rail is spaced apart from and non-parallel to the second rail.

12. The aircraft according to claim 10 , wherein the wing is fairingless at the auxiliary support system.

13. The aircraft according to claim 10 , wherein:

the flap comprises an auxiliary flap hinge about which the flap is rotatable;

the track arm of the auxiliary support system further comprises a spherical bearing; and

the track arm is attached to the auxiliary flap hinge of the flap by the spherical bearing.

14. The aircraft according to claim 10 , further comprising an actuation system coupled to the wing and the flap, wherein:

the actuation system is spaced apart from the auxiliary support system in a spanwise direction along the wing; and

the actuation system is selectively operable to extend the flap from the wing along the extension path and retract the flap toward the wing along the extension path.

15. The aircraft according to claim 14 , wherein:

the flap comprises an inboard end and an outboard end opposite the inboard end;

the flap extends in the spanwise direction from the inboard end to the outboard end;

the actuation system is coupled to the flap at a location between the inboard end and the outboard end;

the aircraft further comprises two auxiliary support systems;

the track arm of each of the two auxiliary support systems is attached to a corresponding one of the inboard end and the outboard end of the flap.

16. The aircraft according to claim 10 , wherein:

the first rail of the track arm is slidably engaged with the first track engagement assembly;

the second rail of the track arm is slidably engaged with the second track engagement assembly; and

slidable engagement between the first rail and the first track engagement assembly and between the second rail and the second track engagement assembly keeps the fixed end portion of the track arm within an extension path comprising a linear portion and a curved portion.

17. A flap actuation assembly for actuating a flap relative to a wing of an aircraft, the flap actuation assembly comprising:

an actuation system coupleable to the wing and the flap, wherein the actuation system is selectively operable to extend the flap from the wing along an extension path and retract the flap toward the wing along the extension path; and

an auxiliary support system comprising:

a base fixable relative to the wing;

a first track engagement assembly fixed to the base;

a second track engagement assembly fixed to the base; and

a track arm attached to the flap and comprising a first rail, directly movably engaged with the first track engagement assembly, and a second rail, directly movably engaged with the second track engagement assembly, wherein a distance between the first rail and the second rail varies along a length of the track arm, wherein:

the track arm comprises a free end portion and a fixed end portion;

the free end portion is opposite the fixed end portion; the fixed end portion is attachable to the flap; and

the first rail and the second rail diverge away from the fixed end portion such that a distance between an inner surface of the first rail and an inner surface of the second rail is greater at the free end portion than at the fixed end portion.

18. The flap actuation assembly according to claim 17 , wherein:

the wing comprises an outer upper surface and an outer lower surface;

the outer upper surface and the outer lower surface define a loft profile of the wing;

the track arm is configured to move along the extension path with the flap; and

an entirety of the auxiliary support system is configured to fit within the loft profile of the wing as the track arm moves along the extension path.

19. The flap actuation assembly according to claim 17 , wherein the actuation system is spatially separate from the auxiliary support system.

20. The flap actuation assembly according to claim 17 , wherein:

the first rail of the track arm is slidably engaged with the first track engagement assembly;

the second rail of the track arm is slidably engaged with the second track engagement assembly; and

slidable engagement between the first rail and the first track engagement assembly and between the second rail and the second track engagement assembly keeps the fixed end portion of the track arm within an extension path comprising a linear portion and a curved portion.