What was found
(CAN) 20-FEB-2019 AFTER 50 FLIGHT HOURS CHIP DETECTORS & OIL FILTERS INSPECTED (FAULT ISOLATION-1 FIG 108, SHEET. 3). FOUND SOME BLACK MATERIAL. MATERIAL REMOVED FROM CHIP DETECTOR, RGB OIL FILTER AND OIL SAMPLE SENT TO LABORATORY FOR ANALYSIS. AFTER #2 ENGINE OIL DRAIN & FLUSH ON #2 RGB CHIP DETECTOR FOUND PIECE OF MATERIAL. THIS MATERIAL IS METALLIC AND ATTRACTS TO MAGNET. PERFORMED BORESCOPE INSPECTION OF RGB 28-FEB-2019 WE HAVE FOUND THAT THE REASON OF METAL DEBRIS IS BROKEN COUPLING, FLEXIBLE, LAYSHAFT P/N 3111026-01 THAT IS PART OF THE REDUCTION GEARBOX (ENGINE).