As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)OPERATOR REPORTED THE ENGINE MAKING A GROWLING NOISE. #4 BEARING FAILED DUE TO THE INSTALLATION OF THE WRONG PART NUMBER RETAINING NUT CUP WASHER. THE CUP WASHER INSTALLED, P/N 3112676-01 IS NOT APPLI CABLE TO THE PW118 AND IS TOO LARGE TO LOCK PROPERLY ON THE IMPELLER ASSEMBLY.