Inspection interval was 300 hours? This one failed 114 hours after the last inspection? As I understand it, inspection intervals are set such that a latent defect had two chances to be detected before a failure occurs. In this case, it sounds like 50-hour inspections are called or. I don’t know how hard this area is to inspect, but if it’s an easy visual to see “is the bolt/nut really there?” maybe frequent inspections aren’t so bad.