Discussion
A designer sizes the wing carry-through for the baseline aircraft only, deferring stretch provision. The likely consequence is
Answer: C
Correct answer: An expensive centre section redesign
The carry-through box carries the wing bending moment, and a stretched variant is heavier and generates more of it. A box sized for the baseline alone will not take the growth.
Redesigning it later means changing the most heavily loaded structure in the aircraft, with new tooling and a fresh certification effort. Building in the margin at the outset costs a little weight on the first variant and saves a great deal on every one after - which is why families are planned from the start.
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