What was found
(CAN) THE REDUCTION GEARBOX WAS FOUND TO BE GENERATING METAL ANALYSED AS BEING M50.- RGB WAS SENT FOR INVEST. OF- METAL CONTAMINATION & RESTROATION. DISASSY OF- RGB FOUND- SOURCE OF THE METAL CONTAMINATION WAS DEFINITELY- SPALLING OF- NR15 BEARING ON ITS OUTER RACE. THIS BEARING WAS- ORIG BEARING INST AT PRODUCTION.-RE IS AMPLE INDICATION OF ELECTRICAL DISCHARGE PIT TING ON- OTHER SURFACES OF- FAILED BEARING & THIS WOULD APPEAR TO BE A CLEAR CASE OF LOW LEVEL ELECTRICAL DISCHARGE PITTING LEADING TO FAILURE OF- BEARING. MAGNETISM IS MINIMAL ON ALL GEARS, PROP SHAFT & PCU COUPLING & BEARINGS.-REFORE LIGHTNING IS NOT THOUGHT TO BE INVOLVED IN THIS FAILURE: