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https://worldairlinenews.com/2015/07/17/the-faa-issues-an-ad-for-possible-boeing-747-8-and-747-8f-divergent-flutter-during-a-high-g-load-maneuver-in-combination-with-certain-system-failures/
The FAA issues an AD for possible Boeing 747-8 and 747-8F "divergent flutter during a high g-load maneuver in combination with certain system failures"