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The wing spar carries the load into the fuselage. The airfoil shape of the wing produces lift which is a force measured in pounds(lbs). This force acts over the surface area of the wing. The structure of the wing with its ribs and skin transfers this load to the wing spar, which transfers it to the fuselage. The spar is like the backbone of the wing.

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Q: Explain the function of a spar in a wing?
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