Discussion
Assertion (A): The ground-air-ground cycle is a major contributor to wing fatigue damage.
Reason (R): It reverses the wing bending completely, once per flight.
Select the correct answer from the options below.
Answer: B
Both are true and the second is the reason for the first. A full reversal from ground droop to flight load produces a large stress range, and stress range is what drives crack growth. One such cycle per flight accumulates rapidly over tens of thousands of flights.
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