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Metal fatigue is a well-established phenomenon, particularly in Aluminum. Carbon fiber composites are much better in this regard.
Cracks are nothing new in airplanes. They have a designed lifetime. After they are worn out the cracks can become unstable and cause fracture. Prior to that the cracks are not harmful. If we made them stout enough not to fatigue they would be too heavy to fly. If made from metal.
It appears that they may have miscalculated the stresses the wings would see and so they may be fatiguing early? Or maybe they are just checking to confirm the cracks are progressing as expected.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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