Propulsion assembly comprising an engine attachment that is compact in terms of height, aircraft comprising at least one such propulsion assembly

1 . A propulsion assembly comprising:

an engine;

a pylon which comprises a primary structure having a front end; and

at least one engine attachment which connects the engine and the front end of the primary structure and comprises

a transverse beam, a first removable connection connecting the transverse beam and the primary structure, and a second connection connecting the transverse beam and the engine,

wherein the first removable connection has

a first contact surface integral with the transverse beam,

a second contact surface integral with the primary structure,

at least one connection element keeping the first contact surface and the second contact surface pressed against one another, and

at least one system for transmission of transverse forces configured to transmit forces, oriented essentially in a vertical direction, between the engine and the primary structure, and

wherein the first removable connection further comprises

at least one waiting fail-safe connection distinct from the at least one connection element and configured to generate an additional path for forces only in an event of malfunction of an element of the first removable connection, wherein the at least one waiting fail-safe connection comprises at least one first shape integral with the transverse beam and projecting relative to the first contact surface and at least one second shape integral with the primary structure, hollow relative to the second contact surface and configured to house the at least one first shape,

wherein the at least one first shape and the at least one second shape interact with one another and having at least one spacing therebetween in the vertical direction, and

wherein the at least one first shape comprises a first trapezoidal contour which has an upper edge and a lower edge substantially parallel to one another and perpendicular to the vertical direction, and oblique edges connecting the upper edge and the lower edge.

2 . The propulsion assembly according to claim 1 , wherein the upper edge has a length greater than the length of the lower edge.

3 . The propulsion assembly according to claim 1 , wherein the at least one first shape is a rib that follows the first trapezoidal contour.

4 . The propulsion assembly according to claim 1 , wherein the at least one second shape comprises a second approximately trapezoidal contour which comprises an upper facet and a lower facet substantially parallel to one another and perpendicular to the vertical direction, and oblique facets connecting the upper facet and the lower facet, the upper facet and the lower facet spaced apart by a distance greater than a distance separating the upper edge and the lower edge of the at least one first shape.

5 . The propulsion assembly according to claim 1 , wherein the first removable connection comprises two systems for transmission of transverse forces positioned symmetrically about a vertical median plane and the at least one waiting fail-safe connection positioned between the two systems for transmission of transverse forces and located in the vertical median plane.

6 . The propulsion assembly according to claim 1 , wherein the first removable connection comprises a first extension and a second extension each integral with the primary structure and which extend on either side of the primary structure, each comprising a portion of the second contact surface, and a system for transmission of transverse forces positioned at the first extension and at the second extension.

7 . The propulsion assembly according to claim 1 , wherein the first removable connection comprises a fitting which has a tubular body fitted in the front end of the primary structure and connected to the primary structure, the tubular body delimiting the at least one second shape and having an end face forming the second contact surface.

8 . The propulsion assembly according to claim 7 , wherein the first removable connection comprises a first extension and a second extension each integral with the primary structure and which extend on either side of the primary structure, each comprising a portion of the second contact surface, and a system for transmission of transverse forces positioned at the first extension and at the second extension, and,

wherein the fitting comprises the first extension and the second extension such that the tubular body, the first extension, and the second extension form a single part.

9 . An aircraft comprising:

at least one propulsion assembly according to claim 1 .