A B747-200 WAS DISPATCHED WITH A DEFECTIVE COCKPIT HANDSET INSTALLED.

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ON SEP/FRI/97; I WAS ASSIGNED TO AN ACR B747-200 SHIP XXX TO PERFORM TURNAROUND MAINT SVC. IN ADDITION TO A MAIN LNDG GEAR TIRE CHANGE AND SEVERAL CABIN DISCREPANCIES; THERE WERE 2 FLT DECK DISCREPANCIES. ONE WAS AN ATTITUDE DEV INDICATOR THAT WAS STICKING AND THE OTHER WAS LOG PAGE ABC RELATING TO THE FLT DECK INTERPHONE HANDSET. THIS HANDSET IS A NON DEFERRABLE (NO-GO) ITEM; AS IT IS USED TO RELAY EMER INSTRUCTIONS; PA ANNOUNCEMENTS AND TO COMMUNICATE WITH THE CABIN CREW MEMBERS IN THE EVENT OF AN EMER. THE LOG PAGE ABC DISCREPANCY WAS DOCUMENTED AS 'COCKPIT INTERPHONE HANDSET RECEIVER IS INTERMITTENT; AND BUTTONS DO NOT SEEM TO WORK PROPERLY.' I WAS INSTRUCTED BY MY LEAD TO REMOVE THE HANDSET FROM SHIP XYZ AND DOCUMENTED SUCH REMOVAL ON LOG PAGE YYY AS 'REMOVED PLT'S HANDSET FOR SHIP XXX.' I THEN INSTALLED THE REMOVED HANDSET IN SHIP XXX AND FUNCTIONAL TESTED THE INSTALLATION; WHICH TESTED OK. DURING THIS TIME; APPROX XX15 HRS; MAINT STORES WAS ADVISED THAT ANOTHER HANDSET WAS NEEDED; TO REPLACE THE ONE REMOVED FROM SHIP XYZ. THE REMOVED/DEFECTIVE HANDSET FROM SHIP XXX WAS PLACED ON THE STORES CLERK'S DESK AND I VERBALLY ADVISED HIM THAT IT WAS A DEFECTIVE PART. THE LEAD MECH WAS ALSO ADVISED THAT THE REMOVED PART WAS DEFECTIVE (HE INSTRUCTED ME TO REMOVE THE HANDSET FROM SHIP XYZ). AT APPROX XA00 HRS I WAS ADVISED AND REPRIMANDED BY THE LEAD MECH THAT DUE TO MY NEGLIGENCE; OF NOT INSTALLING AN UNSERVICEABLE PARTS TAG ON THE UNSERVICEABLE HANDSET; IT HAD BEEN INSTALLED ON SHIP XYZ AS DOCUMENTED ON THE LOG PAGE YYY; OF SHIP XYZ BY MECH JJJ. MY LEAD MECH ADVISED ME THAT DUE TO MY FAILURE TO ATTACH AN UNSERVICEABLE PARTS TAG TO THE HANDSET; THE ACFT HAS DEPARTED WITH AN UNSERVICEABLE PART. IN THE EVENT THAT THIS DEFECTIVE PART CAUSES AN INFLT EMER TO FURTHER DETERIORATE; I AM FILING THE 'NASA' FORM WITH YOUR AGENCY.