What is the primary purpose of a gusset plate in aircraft construction?

The primary purpose of a gusset plate in aircraft construction is to join and reinforce intersecting structural members. Gusset plates are flat triangular or rectangular pieces of metal that are strategically placed at the joints where two or more components meet. By providing additional support at these junctions, gusset plates ensure that the structure can withstand various loads and forces encountered during flight, such as tension, compression, and shear.

This reinforcement is crucial in maintaining the integrity and durability of the airframe, as it helps to distribute loads evenly across the structural elements. Without gusset plates, the joints could become weak points, leading to potential failures under stress. Thus, their primary function is structural reinforcement, making them vital in the design and construction of safe and reliable aircraft.