What was found
EXCESSIVE VIBRATION ON #4 ENGINE NO OTHER INDICATION PRECAUTIONARY SHUTDOWN #4 ENGINE/ TWO BLADES WENT TO FEATHER THIRD BLADE STAYED IN LOW PITCH CONDITION
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
EXCESSIVE VIBRATION ON #4 ENGINE NO OTHER INDICATION PRECAUTIONARY SHUTDOWN #4 ENGINE/ TWO BLADES WENT TO FEATHER THIRD BLADE STAYED IN LOW PITCH CONDITION