Discussion
A fuselage skin at \( 68.8 \) MPa hoop stress cycles once per flight from zero. Over \( 40\,000 \) flights it accumulates
Answer: D
Each flight applies one full pressurisation cycle from zero to the differential and back, so the count equals the number of flights and the stress ratio is zero. It is the single largest identifiable contributor to fuselage fatigue damage.
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