Discussion
A centre wing box \( 6 \) m wide carries a bending moment of \( 2400 \) kN m across the fuselage. If the box is \( 0.5 \) m deep, the cap load is about
Answer: A
Idealising as two flanges, \( M/h = 2400/0.5 = 4800 \) kN. A load of this size is why the centre section is continuous through the fuselage rather than joined at the side of the body, and why the fittings there are among the heaviest on the aircraft.
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