What was found
(CAN) DUE TO PREMATURE WEAR OF NR 2 GEN BRUSHED PILATUS ISSD A S/B (S/B 24-016) TO ADDR ISSUE BY INTRODUCING A NEW LONGER WEARING BRUSH BLOCK ASSY WHICH IS FIELD REPLABLE. PRIOR TO THE S/B WE FOUND BRUSHES ON ORIGLY INST GEN S/N 100092 WITH .686.2 TAT HRS WAS VERY WORN & CAUSED AN OFFLINE SITUATION. GEN WAS REPLD WITH S/N 100049. AT 1124.2 TAT (778 CYC) GEN S/N 100049 BRUSHES WERE REPLD DUE TO WORN AS PER S/B 24-016. AS A RESULT OF OPERATOR INPUT, PER FAILURE RATE OF THESE BRUSHES IT WAS DECIDED TO CHECK THESE BRUSHED AT AROUND 200HRS IN S ERVICE. THESE BRUSHES WERE FOUND TO BE EXTERMELY WORN & ON POINT OF FAILURE: THIS BRUSH ASSY WAS INSERVICE FOR 207HRS 144 CYC.