Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 60; Flight Crew Total 7500; Flight Crew Type 500
Troubleshooting
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport
Aircraft
While executing a routine aircraft verification flight at FL450 felt an unusual vibration and could not determine whether it originated from one of the engines; or whether it was a control surface issue. Immediately requested to leave FL450 and return to land.Controllers were very proactive giving us direct clearances and allowing us to land in a short amount of time.
Phenom 300 flight crew reported unusual vibrations during cruise from an undetermined source.