The inspection’s incudes a torque check.
Typical fasteners materials are a286 steel and Titanium alloys both of these tend to have good fatigue and stress corrosion cracking properties. We do kit have any data of failure mode in these items so an initial drive to increase inspection is a good idea until further details emerge.
As for one failure !? Who knows it may be similar to Alisha air failure where time of flight was nit the crack growth factor but number of airframe cycles. Who knows yet where this investigation finds
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