Assembly for an aircraft comprising an engine of the “open rotor puller” type and means for attaching the latter to the rigid structure of an attachment pylon

An assembly for an aircraft, comprising:

• a part of an aircraft airframe;
• an engine comprising a gas generator and a receiver with a pair of contrarotating unducted rotors positioned forward of the gas generator and centered along an axis of the engine;
• an attachment pylon comprising a rigid structure in the form of a box section which has a proximal end connected to the aircraft airframe part and a distal end laterally separated from the proximal end;
• attachment means for attaching the engine to the attachment pylon,
• in which:
• the rigid structure comprises a rear closure stringer and a first stringer set out forward of the rear closure stringer;
• the engine has a center of gravity shifted forward with respect to the rigid structure;
• the attachment means comprise first attachment means shifted forward with respect to the center of gravity, second attachment means laid out to the rear with respect to the first attachment means and extending in a plane of the first stringer, and third attachment means laid out to the rear with respect to the second attachment means;
• and
• the second attachment means comprise two engine attachments, which are positioned one on each side of a horizontal plane of symmetry of the engine, wherein the third attachment means comprise two second engine attachments arranged one on each side of the horizontal plane of symmetry of the engine.