What was found
(CAN) DURING INITIAL INSTALLATION THE UPPER AND LOWER HALVES ARE MATED TOGETHER WHILE BEING INDIVIDUALLY FITTED TO EACH ACFT. THE UPPER HOUSING HAS A SHORT EXTENDED LIP AT HE AFT OF THE HOUSING TO ALLOW FOR THE ADJUSTMENT FOR THE CUSTOM FIT. THE EXCESS APPROXIMATELY .5" X 16" IS LEFT ON THE ENGINE SIDE OF THE FILTER. OVER THE COURSE OF TIME THE ENGINE VIBRATION HAVE WORN DOWN THE EXCESS FIBERGLASS TO A PAPER THIN LIP, TO THE POINT OF BREAKING OFF AND BEING INGESTED BY THE ENGINE.