What was found
AFTER TAKE OFF HEAVY VIBRATION 5.0 UNITS ENG1 SN.727667, THROTTLE PULLED BACK TO IDLE POWER TILL LANDING, FOUND EXTENSIVE DAMAGE TO SEVERAL FAN BLADES, INLET COWL, EXIT GUIDE VANES. NR 1 ENGINE HAS DAMAGE TO FAN EXIT OUTER CASE ALUMINIUM CASTING DAMAGED ON FLANGE AREA ADJACENT TO FAN EXIT GUIDE VANE PLATFORM & LOCATED BETWEEN 8 AND 9 OCLOCK POSITION. DAMAGE MEASURES APPROX 1.75" CIRCUMFERENTIALLY BY 0.25" WIDE AND IS A MAX DEPTH OF 0.080" DEEP. ITEM CFD PER ECRA 7233-01 253 AND REQUIRES REPLACEMENT WITHIN 5 CYCLES. CLEANED AREA. REPLACED NR 1 ENGINE.