Pilot Institute Practice Test

In aircraft wing construction, what are spars?

Cylinders within the engine. Ribs that form the wing contour. Control surfaces on the wing. Beams that connect the wings to the fuselage.

Correct Answer:

Beams that connect the wings to the fuselage.

Explanation:

Spars are the wing’s main load‑bearing members—the long beams that run from the wing root to the tip and form the primary framework of the wing. They carry the bending loads produced by lift and transfer those forces into the fuselage at the wing root, working together with ribs and skin to create a rigid wing box. This is different from engine cylinders, which are part of the engine; ribs, which define the wing’s airfoil shape; or control surfaces, which are movable parts on the wing. The spars are the key elements that give the wing its strength and attach the wing to the aircraft structure.

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