Discussion
Assertion (A): Honeycomb sandwich is used for floors and control surfaces but not for wing spar caps.
Reason (R): Sandwich construction is efficient where bending stiffness governs rather than direct load.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second explains the first. A spar cap carries a large concentrated axial load, for which a solid section is right, whereas a floor panel or an elevator skin needs stiffness over an area at minimum weight, which is exactly what sandwich provides.
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