What was found
(CAN) DUE TO PREMATURE WEAR OF NR 2 GEN BRUSHES PILATUS ISSD A SB (SB 24-016) TO ADDR ISSUE BY INTRODUCING A NEW, LONGER WEARING BRUSH BLOCK ASSY WHICH IS FIELD REPLABLE.PRIOR TO THE SB, 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) THE GEN S/N 100049 BRUSHES WERE EPLACED DUE TO WORN AS PER SB 24-016. AS A RESULT OF OPERATOR INPUT, PER FAILURE RATE OF THESE BRUSHES IT WAS DECIDED TO CHECK THESE BRUSHES AT AROUND 200 HR INSERVICE. THESEE BRUSHES WERE FOUND TO BE EXTREMELY WORN & ON POINT OF FAILURE: THIS BRUSH ASSY WAS INSERVICE FOR 207 HRS 144 CYCLES.