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Improving an inspection method so the detectable crack size halves, with growth from detection to critical then taking \( 20\,000 \) rather than \( 12\,000 \) flights, changes the interval from 6000 to

  • A.10,000 flights
  • B.6000 flights
  • C.20,000 flights
  • D.3000 flights

Answer: A

Halving the interval requirement over the longer growth period gives 10,000 flights. Investing in a better inspection method therefore buys directly reduced maintenance cost, which is why eddy current and ultrasonic techniques displaced visual inspection for critical details.

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