MAINT CTL MECH HAS PROBS WITH PROCS FOR SIGN OFF ON DEFERRED ITEM. MECH WORKED ON WRONG ENG.

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I WAS WORKING MAINT CTL. DURING THE TURN-OVER FROM PREVIOUS SHIFT; I WAS INFORMED OF AN ACFT ARRIVING IN XXX WITH A DEFERRED ITEM THAT WOULD REQUIRED A RECHK AND THAT A MECH HAD BEEN CALLED. A SHORT TIME LATER I RECEIVED A CALL FROM THE STATION QUESTIONING WHAT THEY SHOULD DO. I TOLD THEM THEY NEEDED AN A&P MECH TO SIGN-OFF THE RECHK. THEY SEEMED UPSET; IT BEING A HOLIDAY WEEKEND; BUT SAID THEY WOULD GET A MECH. BEING VERY BUSY; I RETURNED TO THE OTHER AIRPLANES I WAS WORKING. AT APPROX XA30 LCL I RECEIVED A CALL FROM THE STATION ASKING HOW THEY SHOULD COMPLETE THE PAPERWORK; ADVISING ME THE MECH HAD ACCOMPLISHED THE RECHK BUT THE CAPT HAD TOLD HIM NO LOG ENTRY WAS REQUIRED. SPEAKING WITH THE MECH; HE TOLD ME THE AIRPLANE HAD ALREADY DEPARTED AND ASSURED ME THE RECHK HAD BEEN ACCOMPLISHED. WE DOCUMENTED THE WORK; ALBEIT AFTER DEP. I INFORMED MY MGR AND SENT THE REQUIRED MESSAGE TO OUR QUALITY ASSURANCE DEPT. APPROX 30 MINS LATER I GOT A CALL FROM THE MECH WHO SAID HE HAD CHKED THE WRONG ENG. I CALLED THE NEXT DOWN-LINE STATION WHO THEN AGAIN DID A RECHK. IN TALKING WITH OUR QUALITY ASSURANCE DEPT THE NEXT DAY I WAS INFORMED THAT THIS PARTICULAR ITEM DID NOT REQUIRE A MECH TO ACCOMPLISH A RECHK; A QUALIFIED LCL STATION EMPLOYEE COULD; AND DID; ACCOMPLISH THIS CHK AND DOCUMENT ACCORDINGLY. CONFUSION IN PROCS PLAYED A MAJOR ROLE; OUR QUALITY ASSURANCE DEPT IS IN THE PROCESS OF CLARIFYING THIS PROC. ANOTHER FACTOR WAS THE MECH AND STATION PERSONNEL NOT FOLLOWING PROPER PROCS IN HANDLING MAINT ACTIVITY AT A NON MAINT STATION. OUR QUALITY ASSURANCE DEPT WILL AGAIN REVIEW; WITH THE LCL STATION MGMNT; PROPER PROCS. LOOKING BACK; I NOW UNDERSTAND OUR PROCS AND WILL BE ABLE TO AVOID ANOTHER ERROR OF THIS TYPE. KNOWING THE DEP WAS SAFE AND LEGAL BUT SEEING WHERE CONFUSION IN PROPER PROCS MIGHT LEAD TO A SIMILAR SIT WITH A MORE SENSITIVE ITEM WILL; AND HAS; PROMPTED ME TO FOLLOW UP WITH QUALITY ASSURANCE TO ASSURE THE PROCS ARE CLARIFIED AND PROPER TRAINING IN THIS AREA IS GIVEN TO ALL CONCERNED. IN CLOSING; I SEE WHERE PROPER PROCS SUFFERED AT THE EXPENSE OF EXPEDIENCY AND THAT TRAINING AND UNDERSTANDING CANNOT BE UNDERSTATED.