A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH A #1 ENG FAN BLADE DAMPENER REPLACED BUT NOT INSPECTED PER THE MAINT MANUAL REQUIREMENT.

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ON FEB/XA/99; ACFT XYZ CAME IN TO ZZZ WITH A LOG WRITE-UP FOR HIGH VIBRATION IN THE #1 ENG. LATER THAT DAY; I AND ANOTHER ACFT MAINT TECHNICIAN WERE ASSIGNED TO ACCOMPLISH A FAN BLADE LUBE ON THE ENG. I PULLED UP A COPY OF THE MAINT MANUAL/TASK ORIENTED DOCUMENT AND BEGAN REMOVING THE N1 FAN BLADES. THIS WAS THE FIRST TIME THAT I HAD DONE THIS WORK SO I WAS GOING SLOW AND CAREFUL. WE REMOVED EACH BLADE; LOCK AND DAMPENER; PLACING THEM IN A SPECIAL RACK FOR THIS JOB. WE THEN BEGAN CLEANING AND VISUALLY CHKING EACH PART. UPON COMING TO THE LAST BLADE AND ASSOCIATED PARTS; I NOTICED THAT THE DAMPENER WAS MISSING. I COMMENTED TO MY PARTNER ABOUT THIS AND HE REPLIED THAT I HAD NOT HANDED HIM A DAMPENER FOR THAT BLADE. NOT HAVING ANY PREVIOUS JOB EXPERIENCE; I THOUGHT THAT THIS WAS THE NORMAL AMOUNT OF DAMPENERS AND PROCEEDED TO APPLY THE LUBE. I HAD JUST COMPLETED THE LUBE AT THE END OF THE SHIFT. I TURNED THE JOB OVER TO THE ONCOMING SHIFT; STATING THAT THE COMPONENTS WERE LUBED AND READY TO GO BACK IN. THE NEXT DAY I WAS TOLD THAT THE 2 ACFT MAINT TECHNICIANS THAT TOOK THE JOB OVER HAD FOUND THAT A DAMPENER WAS MISSING AND HAD RPTED THIS TO THEIR SUPVR. I CONFIRMED THAT THE DAMPENER WAS NOT THERE AT REMOVAL; TO THE BEST OF MY KNOWLEDGE.