Assembly for aircraft comprising a primary structure of an attachment pylon attached to a wing box using a bolted connection

An assembly for an aircraft, comprising:

• an aircraft wing comprising a wing box made partly by a front spar and an intermediate spar;
• an engine mounting pylon arranged beneath the wing, the pylon comprising a primary structure in the form of a box having an upper spar extending at least partly beneath the wing box, and a lower spar, lateral panels and transverse reinforcement ribs;
• and
• means for attaching the primary structure of the mounting pylon on the wing box,
• wherein said attachment means comprise a row of bolts along which each bolt passes through one of the transverse reinforcement ribs, and a fitting attached to one of said front and intermediate spars parallel to the row of bolts, and
• wherein certain bolts of the row of bolts pass through one of said transverse reinforcement ribs of the primary structure, and wherein other bolts of the row pass through another transverse reinforcement rib of the primary structure.