Discussion
Assertion (A): A stringer run-out is a fatigue-critical detail.
Reason (R): The load the stringer carried must shear into the skin over a short length.
Select the correct answer from the options below.
Answer: B
Both statements are true and the second explains the first. The abrupt transfer produces a local stress peak that fatigue finds readily, which is why run-outs are tapered gradually and why they appear so often in service cracking reports.
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