A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH 2 BLADE DAMPERS MISSING FROM FAN BLADES ON #2 ENG CAUSING VIBRATION.

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ACFT RPTED #2 ENG VIBRATION DURING APPROX 7000 FT. MECHS RPTED FINDING MISSING BLADE DAMPENER BTWN #37-38 FAN BLADES. REPLACED DAMPENER AND VIBRATION CHKED WITHIN LIMITS. I WAS INVOLVED BECAUSE I SIGNED ITEM 8A FOR TASK ORIENTED DOCUMENT REQUIREMENTS OF MAINT MANUAL. THIS TASK ORIENTED DOCUMENT REQUIRED ME TO CHK THAT 38 BLADES AND BLADE COMPONENTS WERE PROPERLY INSTALLED. THIS I DID WHILE HANDING EACH COMPONENT TO THE MECH THAT MADE THE ACTUAL INSTALLATION. THE ENG WAS RUN WHILE THE ACFT TAXIED APPROX 1 MI FROM THE MAINT HANGAR TO THE TERMINAL. NO PROBS WERE EXPERIENCED. THIS MAINT OCCURRED ON JUN/XA/99; ENDING APPROX XX00. THE VIBRATION OCCURRED ON JUN/XB/99. I CAN FIND NO INFO ON ANY OTHER VIBRATION PROBS DURING THE 2 DAYS OF OP. I WAS INFORMED OF THE PROB 30 DAYS AFTER THE EVENT. I DO NOT BELIEVE THAT ANY PART WAS MISSING FROM THE FAN ON JUN/XA/99. I WAS PRESENT AND ACTUALLY HANDED EACH PART TO THE MECH WHO ASSEMBLED THE FAN GROUP. NO RPTS OF PARTS WERE RPTED AFTER THE ACFT LEFT THE HANGAR.