Component with monolithic structure having blind interface joint

A method of producing a component, comprising:

• providing a monolithic structure that includes a first outer panel, a second outer panel, and one or more spars disposed between the first outer panel and the second outer panel, the one or more spars having a body portion;
• wherein the monolithic structure has a width, a length, and a thickness, the width extends between a fitting end and a distal end, the one or more spars extend widthwise between the first outer panel and the second outer panel between a spar fitting end and a spar distal end;
• wherein the spar fitting end of each of the one or more spars has a Y-shaped configuration with a first finger wall, a second finger wall, and a channel disposed between the first finger wall and the second finger wall;
• wherein the both the first finger wall and the second finger wall have a divergent end disposed at the body of the spar and a finger wall distal end, and the channel has a closed end disposed adjacent the divergent ends of the first finger wall and the second finger wall, and an open end defined at the finger wall distal ends of the first finger wall and the second finger wall;
• providing a fitting element having a body with a lengthwise extending edge surface and one or more blades that extend outwardly from the lengthwise extending edge surface, wherein the one or more blades are configured to mate with the respective channel of the one or more spar fitting ends;
• coupling the monolithic structure with the fitting element such that each of the one or more blades is received within a respective said channel of the one or more spar fitting ends;
• and
• bonding the one or more blades with the respective said channel of the one or more spar fitting ends.