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A mounting structure for mounting a turboprop under an aircraft wing includes a rigid structure provided with an aft underwing box, and at least one forward rigid section. Each forward rigid section has two transverse frames at a spacing from each other. At least one forward rigid section of the rig

A mounting structure for mounting a turboprop under an aircraft wing includes a rigid structure provided with an aft underwing box, and at least one forward rigid section. Each forward rigid section has two transverse frames at a spacing from each other. At least one forward rigid section of the rigid structure also includes at least one forward upper box connecting a top part of the two transverse frames of the forward rigid section.

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The invention claimed is: 1. A mounting structure for mounting a turboprop under an aircraft wing, said structure comprising: a rigid structure provided with an aft under-wing box, and at least one forward rigid section, each forward rigid section having two transverse frames at a spacing from each

The invention claimed is: 1. A mounting structure for mounting a turboprop under an aircraft wing, said structure comprising: a rigid structure provided with an aft under-wing box, and at least one forward rigid section, each forward rigid section having two transverse frames at a spacing from each other, wherein at least one forward rigid section of the rigid structure also comprises at least one forward upper box connecting a top part of the two transverse frames of said forward rigid section, wherein each forward upper box comprises a lower stringer, an upper stringer, two side plates, and a plurality of transverse inner ribs connecting said stringers and said side plates. 2. A mounting structure according to claim 1 for mounting a turboprop, wherein at least one forward rigid section of the rigid structure also comprises at least two lateral connecting rods arranged on each side of the upper forward box, said at least two lateral connecting rods connecting the two transverse frames of said forward rigid section. 3. A mounting structure according to claim 2 for mounting a turboprop, wherein said lateral connecting rods are articulated on fittings fixed to the transverse frames. 4. A mounting structure according to claim 2 for mounting a turboprop, wherein said lateral connecting rods are embedded in the transverse frames. 5. A mounting structure according to claim 2 for mounting a turboprop, wherein at least one forward rigid section of the rigid structure includes only four lateral connecting rods arranged on each side of the forward upper box. 6. A mounting structure according to claim 1 for mounting a turboprop, wherein at least one forward rigid section of the rigid structure also comprises at least two forward side boxes arranged on each side of the forward upper box, said at least two forward side boxes connecting the two transverse frames of said forward rigid section. 7. A mounting structure according to claim 6 for mounting a turboprop, wherein at least one forward rigid section of the rigid structure includes only two forward side boxes arranged on each side of the forward upper box. 8. A mounting structure according to claim 1 for mounting a turboprop, comprising two forward rigid sections with a common intermediate transverse frame. 9. A mounting structure according to claim 1 for mounting a turboprop, wherein each forward rigid section comprises a single forward upper box connecting the upper part of the two transverse frames of said forward rigid section. 10. A mounting structure according to claim 1 for mounting a turboprop, each forward upper box is made from titanium. 11. A mounting structure for mounting a turboprop under an aircraft wing, said structure comprising an aft under-wing box; a forward section located forward of said aft under-wing box, said forward section including two transverse frames spaced apart from each other, wherein one of said two transverse frames is connected to said aft under-wing box, said forward section comprising a forward upper box extending between said two transverse frames and connecting a top part of each of the two transverse frames of said forward section, wherein said forward upper box comprises a lower stringer extending between said two transverse frames and along a bottom portion of said forward upper box; an upper stringer extending between said two transverse frames and along a top portion of said forward upper box; two side plates, each extending between said two transverse frames and along a side of said forward upper box; and a plurality of transverse ribs connecting said lower stringer, said upper stringer and said two side walls to each other. 12. A mounting structure according to claim 11, wherein said forward upper box is closed. 13. A mounting structure according to claim 11, wherein said forward upper box forms an approximately parallelepiped shaped space. 14. A mounting structure according to claim 11, wherein said two transverse frames have an upside-down U-shape. 15. A mounting structure according to claim 11, comprising a second forward section located forward of said forward section. 16. A mounting structure according to claim 15, wherein said second forward section comprises two transverse frames spaced apart from each other, wherein one of said two transverse frames of said second forward section is connected to said forward section. 17. A mounting structure according to claim 16, wherein said second forward section comprises a second forward upper box extending between said two transverse frames of said second forward section and connecting a top part of each of the two transverse frames of said second forward section. 18. A mounting structure for mounting a turboprop under an aircraft wing, said structure comprising an aft under-wing box; a forward section located forward of said aft under-wing box, said forward section including two transverse frames spaced apart from each other, wherein one of said two transverse frames is connected to said aft under-wing box, said forward section comprising a forward upper box extending between said two transverse frames and connecting a top part of each of the two transverse frames of said forward section wherein said mounting structure extends along a longitudinal axis passing through said two transverse frames, and said aft under-wing box comprises a lower stringer extending along said longitudinal axis; an upper stringer extending along said longitudinal axis; two side walls extending along said longitudinal axis; and a plurality of transverse ribs connecting said lower stringer, said upper stringer and said two side walls to each other.