Arrangement for coupling a coupling pivot for a trimmable horizontal stabiliser to the tail fuselage of an aircraft

1. An arrangement for coupling a coupling pivot for a trimmable horizontal stabilizer to the tail fuselage of an aircraft, in which the tail fuselage comprises at least one frame and one outer covering joined to the frame, said arrangement comprising:

an inner plate with a first upper fastening hole, a first lower fastening hole and a first passage hole between the first upper fastening hole and the first lower fastening hole;

an outer plate with a second upper fastening hole, a second lower fastening hole and a second passage hole between the second upper fastening hole and the second lower fastening hole;

the first upper and lower fastening holes facing the second upper and lower fastening holes, respectively, and the first passage hole facing the second passage hole so as to permit the passage of a coupling pivot of the horizontal stabilizer;

an upper coupling lug located between the first and second upper fastening holes and a lower coupling lug located between the first and second lower fastening holes, said upper and lower lugs being respectively arranged above and below a cut-out provided for the horizontal stabilizer in a covering of the aircraft;

a first securing element traversing an upper space formed by the upper lug and the first and second upper fastening holes; and

a second securing element traversing a lower space formed by the lower lug and the first and second lower fastening holes;

wherein

the coupling lugs are integral with separate reinforced zones of the covering of the tail fuselage in respective neighboring areas of the cut-out and of the frame;

the inner and outer plates clasp at least the respective reinforced zones in which the coupling lugs are provided therebetween.

2. An arrangement according to claim 1 , wherein the covering of the tail is made of a composite material and at least one of the reinforced zones is a zone with increased thickness of composite material.

3. An arrangement according to claim 2 , wherein the composite material is a carbon fiber reinforced plastic.

4. An arrangement according to claim 2 , wherein at least one of the reinforced zones is a zone in which a reinforcing plate has been applied.

5. An arrangement according to claim 2 , wherein the inner and outer plates have an elongated rhomboid shape.

6. An arrangement according to claim 2 , wherein the outer plate and the inner plate are metallic.

7. An arrangement according to claim 2 , wherein the outer plate and the inner plate are made of a carbon fiber material.

8. An arrangement according to claim 1 , wherein at least one of the reinforced zones is a zone in which a reinforcing plate has been applied.

9. An arrangement according to claim 8 , wherein the reinforcing plate is a plate made of a composite material.

10. An arrangement according to claim 9 , wherein the composite material is a carbon fiber reinforced plastic.

11. An arrangement according to claim 8 , wherein the reinforcing plate is a metallic plate.

12. An arrangement according to claim 11 , wherein the metallic plate is a titanium plate.

13. An arrangement according to claim 8 , wherein the composite material is a carbon fiber reinforced plastic.

14. An arrangement according to claim 8 , wherein the inner and outer plates have an elongated rhomboid shape.

15. An arrangement according to claim 8 , wherein the outer plate and the inner plate are metallic.

16. An arrangement according to claim 8 , wherein the outer plate and the inner plate are made of a carbon fiber material.

17. An arrangement according to claim 1 , wherein the inner and outer plates have an elongated rhomboid shape.

18. An arrangement according to claim 1 , wherein the outer plate and the inner plate are metallic.

19. An arrangement according to claim 1 , wherein the outer plate and the inner plate are made of a carbon fiber material.