Which of the following would NOT shorten an aircraft's fatigue life?
Answer: C
Smooth high-altitude cruise accumulates damage slowly, since the gust content is low and the flights are long, so each pressurisation cycle covers more hours. The other three all raise the rate at which damage is accumulated.
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A short-haul aircraft reaches its pressurisation cycle limit sooner than a long-haul one because
Answer: D
Fuselage fatigue is driven by cycles rather than hours, and a regional aircraft may fly six or eight sectors a day against a long-haul aircraft's one. Life limits for such airframes are therefore quoted in cycles, and a fleet's utilisation pattern determines which limit is reached first.
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