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Assertion (A): Pressurisation is the load case that sizes a transport fuselage.

Reason (R): Pressurisation applies a cyclic hoop and longitudinal tension once per flight.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both statements are true and the second is the reason for the first. The static stress is modest, but its repetition over tens of thousands of flights is what governs, so the fuselage is sized by fatigue and damage tolerance rather than by ultimate strength.

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