Discussion
A limit load of \( 150 \) kN is factored to ultimate. The ultimate load is
Answer: C
Correct answer: 225 kN
\[ 150 \times 1.5 = 225\ \mathrm{kN}. \] The factor of safety between limit and ultimate load is 1.5 in essentially all civil airworthiness codes. The limit load must be carried without detrimental permanent deformation; the ultimate load must be carried for three seconds without failure.
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