A B737-300 WAS RETURNED TO SVC IN NON COMPLIANCE WITH THE HORIZ STABILIZER JACK SCREW INSPECTION MADE BY AN UNQUALIFIED TECHNICIAN.

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I AM AN A&P MECH WORKING FOR ACR X AIRLINES. ACFT X CAME TO ZZZ FEB/SAT/02 FOR A K-CHK. WHILE ACCOMPLISHING THE LUBE JOB ON THE HORIZ JACK SCREW FOR THE STABILIZER; A TECHNICIAN OBSERVED WHAT HE THOUGHT WAS WEAR ON THE SCREW ASSEMBLY OF THE JACK SCREW. HE MADE A WRITE-UP FOR THAT SUSPECTED PROB. THE PLANE STAYED ON THE GND UNTIL FEB/MON/02 WHEN MAINT MGR APCHED ME TO GO AND EVALUATE THE PROB. THE REASON I WAS APCHED WAS THAT WHILE I HAVE BEEN EMPLOYED AT ACR X; I BECAME A SHOP TRAINED [DESIGNATED INSPECTOR] FOR THE B737 HORIZ STABILIZER JACK SCREW. ZZZ MGMNT SUPPLIED ME WITH AN AUTH SHOP JOINT DOCUMENT MANUAL TO INSPECT THE JACK SCREW PERSONALLY. I INSPECTED THE JACK SCREW AND FOUND IT TO BE SVCABLE. I INFORMED ACR X; ZZZ MGR AND ZZZ FOREMAN THAT I FOUND JACK SCREW TO BE SVCABLE PER ZZZ SHOP JOINT DOCUMENT; BUT THAT I WAS UNABLE TO RELEASE THE JACK SCREW BACK INTO SVC BECAUSE MY QUALIFICATION AS A DESIGNATED INSPECTOR WAS MOVED IN MY TRAINING RECORDS TO AN INACTIVE FILE. A SHOP JOINT DOCUMENT IS NOT AN APPROVED MANUAL FOR A LINE MECH TO SIGN OFF A WRITE-UP WITH. AFTER SOME CONSULTATION; ZZZ MGMNT CAME TO THE CONCLUSION THAT MY DST QUALIFICATION WOULD BE MOVED TO AN ACTIVE FILE AND THAT I COULD SIGN OFF THE JACK SCREW PROB. I SIGNED OFF THE JACK SCREW AND WENT HOME WITH THE ASSURANCE THAT EVERYTHING WOULD BE HANDLED. I LATER FOUND OUT LCL ZZZ MGMNT DID NOT ACTIVATE MY QUALIFICATION; THEREFORE; MAKING ME NOT LEGAL TO RELEASE THE JACK SCREW BACK INTO SVC USING A SHOP JOINT DOCUMENT SINCE I AM A LINE MECH. I FEEL I WAS DECEIVED BY ACR X ZZZ MGMNT IN ORDER TO GET A PLANE BACK INTO SVC. I FEEL THE JACK SCREW IS SVCABLE PER ACR X JOINT DOCUMENT.