Repairs can cover and conceal evidence of structural weakening Fatigue damage under patches known as doublers can be deadly, and an expanded hunt must be mounted to find spreading cracks before they cause a catastrophe. That is the central message in a battery of recommendations issued April 8 by the National Transportation Safety Board (NTSB). "Hidden damage [can be] crucial because fatigue cracking in the pressurized compartments of an airplane ... could lead to catastrophic structural failure," the NTSB warned.…
Safety Board Calls for Inspections of Repair Patches
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