What was found
ATH FLT 759 EN ROUTE ATH TO PHL. DURING TAKEOFF, AT ABOUT 50 FT AGL, A LOUD NOISE FOLLOWED BY A LEFT ENGINE VIBRATION OCCURRED. THE LEFT ENGINE POWER WAS PULLED BACK. THE CAPTAIN DECLARED AN EMERGENCY AND RETURNED TO THE FIELD IN ATH. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND FIVE DAMAGED FAN BLADES ON THE NUMBER ONE ENGINE. THE DAMAGE WAS CAUSED BY A BIRD STRIKE. THE FAN BLADES WERE REPLACED.