Discussion
A structure demonstrates \( 120\,000 \) cycles in test. With a scatter factor of \( 3 \), the certified life is
Answer: C
Correct answer: 40,000 cycles
\[ \frac{120{,}000}{3} = 40{,}000\ \mathrm{cycles}. \] The scatter factor accounts for the spread of fatigue life between nominally identical specimens, which is wide. A single test demonstrates one sample from that distribution, and dividing by three brings the certified figure down to something the whole fleet can be expected to achieve.
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