A B737-200 HAD THE AIRSTAIR DRIVE MOTOR REPLACED. THE REQUIRED INSPECTION WAS NOT ACCOMPLISHED. TECHNICIAN WAS ADVISED BY THE LEAD TECHNICIAN NO INSPECTION WAS REQUIRED.

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I AM NEW TO LINE MAINT. XFERRED IN FROM THE ULD SHOP; AND HAD BEEN ON THE LINE FOR 4 DAYS AT THE TIME OF THE EVENT. I'VE BEEN IN TRAINING SINCE STARTING AND HAVE NOT YET BEEN RELEASED FROM TRAINING. I WAS ASSIGNED TO THIS TASK WITHOUT A TRAINER OR TRAINING ON PROCS FOR SIGNING OFF INSPECTION ITEMS. I FELT THE LEAD ON DUTY; WHO I FEEL IS VERY COMPETENT; WAS CORRECT IN HIS ASSESSMENT THAT THIS WAS NOT AN INSPECTION ITEM. ON THE DAY OF THE EVENT THERE WAS NOT A TRAINER AVAILABLE TO WORK WITH ME FOR THE SHIFT. I WAS ASSIGNED TO WORK IN THE HANGAR AS A TECHNICIAN RELEASED FROM TRAINING. I WAS INSTRUCTED BY THE LEAD ON DUTY TO REPLACE THE AIRSTAIR DRIVE MOTOR ON ACFT. THE DOOR WAS ON MEL AND NEEDED TO BE CLRED. IN THE PROCESS OF REPLACING THE MOTOR THE INSPECTOR ON DUTY ASKED ME IF THIS WAS AN INSPECTION ITEM. I DID NOT KNOW IF IT WAS OR WAS NOT SO HE SAID HE WOULD CHK BUT GO AHEAD AND LEAVE THE GILL LINER OPEN JUST IN CASE IT DOES NEED TO BE INSPECTED; WHICH I DID. I WOULD SAY ABOUT 1 HR LATER THE LEAD ON DUTY TOLD ME TO CLOSE UP THE GILL LINER AS THE MOTOR WAS NOT AN INSPECTION ITEM. I ASSUMED THIS TO BE THE CASE SO I COMPLIED AND FINISHED UP THE JOB. I DO NOT KNOW IF THERE WAS ANY CONVERSATION BTWN THE LEAD AND INSPECTOR BUT I ASSUMED THEY HAD SPOKEN TO EACH OTHER. THE AIRSTAIR OPS CHKED NORMAL SO I SIGNED THE JOB OFF IN THE LOGBOOK AND THE PLANE WAS PLACED INTO SVC. 11 DAYS HAVE PASSED SINCE THE EVENT AND TONIGHT (NOV/WED/06) I LEARNED THAT I MAY HAVE MADE A MISTAKE AND SHOULD HAVE HAD THE MOTOR INSTALLATION INSPECTED.