What was found
DURING DESCENT AND PASSING THRU FL280, FLIGHT CREW DETECTED AN IMMEDIATE AND NOTICEABLE VIBRATION WHICH BECAME CONSIDERABLY WORSE AS THE DESCENT CONTINUED, CREW THEN RECEIVED A RH ENGINE VIBRATION CAS MESSAGE. AFTER COMPLETING THE ENGINE VIBRATION CHECKLIST, THE CREW SHUT DOWN THE RT ENGINE, AS THE VIBRATION WAS WORSENING AND BECOMING MORE SIGNIFICANT. FLIGHT CREW DECLARED AN EMERGENCY AND LANDED UNEVENTFULLY. MAINTENANCE WILL BE REMOVING THE ENGINE AND SENDING IT TO A REPAIR FACILITY FOR TEAR DOWN AND ANALYSIS.