No Fault Founds (NFFs) occur when parts appear faulty on an aircraft or in a line check, but test as fault-free in the shop. They are a frustrating waste of money and effort because although they appear to be benign, they still must be vetted. Reducing NFFs remains tough to accomplish. As old causes are discovered and resolved, new challenges arise, for example in increasingly complex avionics software. The best long-term approach requires thorough collaboration between airlines, ...

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