What was found
FLT CREW REPORTED ABNORMAL VIBRATION THROUGHOUT ACFT IN ALL PHASES OF FLIGHT. VIBRATION BECAME WORSE WITH PROPS AT MAX AND HIGHER TORQUE SETTINGS. ACFT LANDED WITHOUT FURTHER INCIDENT. AFTER LANDING, RT ENG NACELLE WAS FOUND TO BE COATED WITH FLUID. ALL ENGINE INSTRUMENTS INDICATED NORMAL OPERATING CONDITIONS AND THERE WERE NO ASSOCIATED WARNING OR CAUTION LIGHTS. MX REPORTED THAT WHILE REMOVING PROPELLER, NR 4 BLADE HAD EXCESSIVE PLAY. PROPELLER ASSY WAS DISASSEMBLED AND IT WAS DISCOVERED THAT INNER RACE BRG PN 782302-1 AND OUTER RACE PN 782301-1 HAD DISINTEGRATED.