The FAA, citing a need to keep rulemaking transparent, has restored language on an engine component vibration testing rule that triggered industry opposition after being adopted without public comment. Opposition to the change came from the Modification and Replacement Parts Association (Marpa), which filed a suit seeking to have the July 5 revision dropped. That change would have required on-engine tests as part of certification process “surveys” for components, such as fan blades. ...


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