Discussion
Assertion (A): Most airframe fatigue cracks start at fastener holes.
Reason (R): A hole concentrates stress by roughly a factor of three and the drilling damages the edge.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. Cold working, interference-fit fasteners and careful hole preparation all address this directly, and they are standard practice in fatigue-critical structure.
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