What was found
UPON DEPARTURE, AIRCRAFT EXPERIENCED ENGINE VIBRATION OF UNKNOWN ORIGIN IN NR 1 POSITION. EMERG PROCEDURES C/W, AND ACFT RETURNED TO DEPARTURE STA WITHOUT INCIDENT. UPON INSP BY WORLD AIRWAY MAINT REP, DISCOVERED THE NOSE CONE (SPINNER) ON NR 1 ENGINE HAD DELAMINATED AND MATERIAL INGESTED INTO THE ENGINE (NR 1 POS) DAMAGING ALL THE FAN BLADES, TWO INLET GUIDE VANES, AND ENGINE NOSE COWL. FAN BLADES, INLET GUIDE VANES, AND SPINNER HAVE BEEN REPLACED. ENGINE RUN-UP AND BLADE TRIM BALANCE ACCOMPLISHED SATISFACTORY. REPAIRS TO DAMAGED NOSE COWL MADE USING DATA FURNISHED BY MFG. (X)