A B737-300 WAS FOUND TO HAVE 1 FAN BLADE ON THE L ENG WITH THE LEADING EDGE CURLED AT MID SPAN. NO DOCUMENTATION ON BLADE DAMAGE FOUND IN LOGBOOK.

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DURING PREFLT INSPECTION; I NOTED A 1.5 INCH DEFORMITY ON A #1 ENG FAN BLADE. THE DEFORMITY WAS ON A LEADING EDGE AT MID-SPAN AND APPEARED TO BE THE RESULT OF A SMALL BIRD STRIKE. THE WORD 'OK' WAS WRITTEN NEXT TO THE DEFORMITY ON THE FAN BLADE. I NOTIFIED THE CAPT AND WE CHKED THE LOGBOOK. IN THE DEFERRED MAINT SECTION; WE FOUND THE FOLLOWING ENTRY: #1 ENG REQUIRES BORESCOPE INSPECTION WITHIN NEXT 10 CYCLES FOR BIRD STRIKE.' BELOW WAS WRITTEN: 'BORESCOPE PERFORMED. NO DEFECTS NOTED.' CLRNC XXXX APR/XA/04. WE DISCUSSED THE WRITE-UP AND CONCLUDED THE ENG AND ACFT WAS GOOD TO FLY. LATER; AFTER FURTHER DISCUSSION ON THE 3RD LEG OF THE DAY; WE REEXAMINED THE LOGBOOK AND NOTED THAT THERE WAS NO SPECIFIC REF TO THE FAN BLADE -- ONLY THAT THE ENG HAD 'NO DEFECTS.' THERE WAS NOTHING INDICATING THE FAN BLADE HAD BEEN DAMAGED AND THEN LATER CLRED FOR FLT. WE AGREED THAT AN 'OK' ON THE FAN BLADE WITHOUT DOCUMENTATION IN THE LOGBOOK IS PROBABLY INSUFFICIENT. THE INFO SHOULD HAVE BEEN ANNOTATED IN THE LOGBOOK FOR FLT CREW REVIEW.