Ground vibration testing is one of the last things usually done before final tweaks of flight control systems. If it is mechanical with analog dampers, you'll put in the required notches in the analog filters. If it is digital fly-by-wire, you put those notches in the software. GVT is also vital in order to confirm Vne plans. Looks like we're getting close.
http://www.marketwatch.com/story/bombardier-completes-cseries-aircraft-ground-vibration-tests-and-final-software-upgrades-in-preparation-for-first-flight-2013-06-26
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