What was found
ENGINE RECEIVED FOR CORR & HOT SECT INSP PER SB 1508. ENG OPERATED TO 1,227 HRS TIME SINCE LAST HOT SECT INSP. ENG SUFFERED LOSS OF 3 EA NOZZLE GUIDE VANES COMPLETELY BURNED IN HALF ALLOWING INNER SHROUD HALVES TO ENTER GAS PATH & DAMAGE TURB. FAILURE RESULTED IN DOMESTIC OBJECT DAMAGE OF ALL 92 EA 1ST STAGE & 46 EA 2ND STAGE TURB BLADES. P & W SB 1508, REV NR 16, OUTLINES RECOMMENDED 1,500 HR HOT SECT INSP INTERVAL. FAILURE IS PARTICULAR TO JT12A-8 ENG PARTICULAR TO NA26540 (DASH 8 CONFIGURED) & ALL 60 MDL ACFT. SUBMITTER STATES HAVE EXPERIENCED 30-40 ENG OVER LAST 6 YRS THAT SUFFERED NOZZLE GUIDE VANE FAILURES & SUBSEQUENT TURB BLADE IMPACT DAMAGE FROM NOZZLE GUIDE VANE MATL RELEASED INTO TURB GAS PATH.