MECHANIC IS INFORMED AN MD-80 HE HAD WORKED; WAS FOUND WITH A LEFT ELEVATOR DAMPENER LINK NOT FULLY INSTALLED.

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I WAS INFORMED ON JUL/XA/08 THAT ACR X HAD A L-HAND ELEVATOR DAMPENER LINK NOT FULLY INSTALLED. I WAS ONE OF THE MECHS INVOLVED WITH THE ELEVATOR MAINT; AND WAS NOT AWARE OF THE DAMPENER LINK NOT BEING FULLY INSTALLED. SUPPLEMENTAL INFO FROM ACN 798664: IN REGARDS TO THE L-HAND ELEVATOR INSTALLATION ON ACFT X; THE ACFT WAS IN DOCK FOR A PHASE INSPECTION. AT THE END OF THE CHK; I RECEIVED A PHONE CALL FROM THE DOCK SUPVR INFORMING ME THAT THEY WERE HAVING A PROB WITH NON ROUTINE JOB WRITE-UP. THEY INFORMED ME THAT THE ELEVATOR HAD BEEN INSTALLED OVER THE WEEKEND AND SIGNED OFF BY THEIR MECH WITH THE RII BUY-BACK ACCOMPLISHED BY OUR WEEKEND INSPECTOR. AFTER REVIEWING THE NON ROUTINE; I FOUND ON THE BACK THAT MECH MR Z HAD SIGNED OFF THAT HE HAD INSTALLED THE L-HAND ELEVATOR WITH INSPECTOR ACCOMPLISHING THE RII SIGNOFF. MECH MR W HAD XFERRED HIS SIGNOFF FOR THE INSTALLATION TO THE FRONT OF THE NON ROUTINE AS ITEM 1A WITHOUT GETTING THE INSPECTOR MR Z TO SIGN WITH HIM. INSPECTOR WAS NOT AVAILABLE AND THE ACFT WAS OUTBOUND. AFTER REVIEWING THE DOCUMENTATION AND FINDING THAT THE ELEVATOR INSTALLATION HAD BEEN PREVIOUSLY SIGNED OFF BY A MECH AND THE RII ACCOMPLISHED BY AN INSPECTOR; I BACK-SIGNED WITH THE MECH ON THE FRONT OF THE NON ROUTINE STEP 1A TO COMPLETE THE PAPERWORK.