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An engine attachment pylon for an aircraft including a rigid structure including a box including an upper spar and a lower spar, connected to each other through two lateral panels. At least one of the upper and lower ends of the web of at least one of the two lateral panels includes at least one ass

An engine attachment pylon for an aircraft including a rigid structure including a box including an upper spar and a lower spar, connected to each other through two lateral panels. At least one of the upper and lower ends of the web of at least one of the two lateral panels includes at least one assembly cleat projecting sideways from the web towards the outside of the box, and assembled to the spar on which it bears through an attachment mechanism located outside the inner space in the box.

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1. An engine attachment pylon for an aircraft, the pylon comprising: a rigid structure including a box, the box including an upper spar and a lower spar connected to each other by two lateral panels, the two lateral panels extending in a longitudinal direction of the engine,wherein each of the two l

1. An engine attachment pylon for an aircraft, the pylon comprising: a rigid structure including a box, the box including an upper spar and a lower spar connected to each other by two lateral panels, the two lateral panels extending in a longitudinal direction of the engine,wherein each of the two lateral panels includes a web delimiting a side space inside the box where an upper end of the web faces the upper spar and a lower end of the web faces the lower spar,wherein at least one of the upper end of the web and the lower end of the web of at least one of the two lateral panels includes at least one assembly cleat projecting sideways from the web towards an outside of the box and in a direction substantially perpendicular to the longitudinal direction of the engine, andwherein the at least one assembly cleat is assembled to one of the upper spar and the lower spar via an attachment mechanism located outside the inner space of the box. 2. A pylon according to claim 1, wherein each of the lower end of the web and the upper end of the web of the two lateral panels includes at least one assembly cleat projecting sideways from the web towards the outside of the box and in a direction substantially perpendicular to the longitudinal direction of the engine, and wherein the at least one assembly cleat is assembled to one of the upper spar and the lower spar via an attachment mechanism located outside the inner space in the box. 3. A pylon according to claim 1, wherein each assembly cleat runs continuously along an associated one of the upper spar and the lower spar, along substantially an entire length of the associated spar. 4. A pylon according to claim 1, wherein the attachment mechanism includes bolts or rivets. 5. A pylon according to claim 1, further comprising two lateral aerodynamic skins fixed on the box of the rigid structure, wherein each of the two lateral aerodynamic skins faces the web of one of the two lateral panels and is at a distance away from the web. 6. A pylon according to claim 5, wherein each lateral skin and the lateral panel facing the lateral skin form a compartment of the pylon through which at least one of hydraulic and electrical systems pass. 7. A pylon according to claim 6, wherein the lateral skins and the lateral panels jointly form two pylon compartments arranged on each side of the inner space in the box, with hydraulic systems passing through one of the two compartments and electrical systems passing through the other of the two compartments. 8. A pylon according to claim 1, wherein the inner space forms a duct through which compressed air passes. 9. An engine assembly for an aircraft comprising: an engine; andan engine attachment pylon,wherein the pylon is an attachment pylon according to claim 1. 10. An aircraft comprising at least one engine assembly according to claim 9. 11. An engine attachment pylon for an aircraft, the pylon comprising: a rigid structure including a box, the box including an upper spar and a lower spar connected to each other by two lateral panels; andtwo lateral aerodynamic skins fixed on the box of the rigid structure,wherein each of the two lateral panels includes a web delimiting a side space inside the box where an upper end of the web faces the upper spar and a lower end of the web faces the lower spar,wherein at least one of the upper end of the web and the lower end of the web of at least one of the two lateral panels includes at least one assembly cleat projecting sideways from the web towards an outside of the box,wherein the at least one assembly cleat is assembled to one of the upper spar and the lower spar via an attachment mechanism located outside the inner space of the box,wherein each of the two lateral aerodynamic skins faces the web of one of the two lateral panels and is at a distance away from the web, andwherein each lateral skin and the lateral panel facing the lateral skin form a compartment of the pylon through which at least one of hydraulic and electrical systems pass. 12. A pylon according to claim 11, wherein the lateral skins and the lateral panels jointly form two pylon compartments arranged on each side of the inner space in the box, with hydraulic systems passing through one of the two compartments and electrical systems passing through the other of the two compartments.