Aircraft engine assembly, comprising an engine attachment device equipped with structural movable cowls connected to the central box

An aircraft engine assembly 5 comprises a double flow engine 10 and a device 4 for attaching the engine to an aircraft structure. The device 4 comprises a primary structure 8 which includes a central box 8a and two movable structural cowls 8b. The assembly further includes a group of main ties laid out in a main transverse plane P1 for absorbing forces crossing a front end of the movable structural cowls 8b. This group consists of three main shearing pins (50', 50" fig 4) radially oriented and distributed around a longitudinal axis 6 of the engine. Each pin crosses a first shearing orifice 54 provided on a fitting 56 secured to the hub 16 of the intermediate case on the one hand, and a second shearing orifice 58 provided on one of the movable cowls 8b or on its connecting structure to the central box on the other hand. The arrangement is intended to reduce the size of the attachment means between an aircraft and an engine 10.