As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE DISSIMILAR METAL TAPE SUPPLIED IN STC SA00496SE (U-LINE ELECTRICAL TAPE) IS CAUSING CORROSION ON THE ENGINE MOUNT TO THE POINT OF REPLACING THE ENGINE MOUNT WITH IN 500-100HRS AFTER INSTALLING THE STC. THIS HAS HAPPENED ON THREE OF OUR FLEET AIRCRAFT IN THE LAST 2 WEEKS. I BELIEVE THE ADHESIVE ON THE TAPE IS CAUSING THE POWDER COAT AND CORROSION ON THE THE CHROMOLY ENGINE MOUNT. THE CORROSION ONLY OCCURS WHERE THE TAPE IS APPLIED. ALL ENGINE MOUNTS WERE PURCHASED NEW FROM AWI DURING THE NEW ENGINE INSTALL.