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Which of these is NOT a reason fuselage fatigue life is quoted in cycles rather than hours?

  • A.Short-haul aircraft accumulate cycles far faster than long-haul
  • B.Cabin pressure differential increases with flight duration
  • C.Each flight applies one full pressurisation cycle
  • D.The ground-air-ground cycle also occurs once per flight

Answer: B

The differential is set by cruise altitude, not by how long the flight lasts, so a two-hour and a twelve-hour sector apply much the same cycle. The other three are exactly why cycles rather than hours are the meaningful measure.

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