A PIPER PA23 WAS SIGNED OFF AS BEING AIRWORTHY BUT IN FACT HAD AN AIRWORTHINESS DIRECTIVE THAT WAS NOT ACCOMPLISHED.

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ON MAR/MON/02; I DISCOVERED THAT AIRWORTHINESS DIRECTIVE 96-09-10 ON BOTH ENGS ON ACFT X HAD NOT BEEN COMPLIED WITH. I HAD SIGNED THE ACFT OFF AS BEING AIRWORTHY ON MAR/FRI/02. AT THAT TIME; WE CONTACTED THE OWNER THAT THE ACFT WAS NOT AIRWORTHY AND THAT THE AIRWORTHINESS DIRECTIVE NEEDED TO BE COMPLIED WITH. IN THE LAST COPY OF THE AIRWORTHINESS DIRECTIVE COMPLIANCE RECORD (DATED NOV/WED/00); THE AIRWORTHINESS DIRECTIVES WERE NOTED AS BEING COMPLIED WITH BY AIRWORTHINESS DIRECTIVE 81-18-04 AT O/H. SEE WORK ORDER XXXXX BY MR X A&P/IA. AFTER TALKING TO THE ENG OVER HAULER; WE DISCOVERED THAT THE PARTS INSTALLED IN THESE ENGS NEEDED TO BE REPLACED TO COMPLY WITH AIRWORTHINESS DIRECTIVE 96-09-10. THE OWNER OF THE ACFT TALKED TO MR X AND HE TOLD HIM THAT HIS LCL FSDO HAD INTERPED THE AIRWORTHINESS DIRECTIVE AND DECIDED THAT IT DID NOT APPLY TO THESE ENGS. AFTER WE INFORMED MR X OF OUR FINDINGS; HE AGREED THAT THE AIRWORTHINESS DIRECTIVE NEEDED TO BE COMPLIED WITH. ON MAR/TUE/02; WE REMOVED THE ENGS FROM THE ACFT AND REMOVED THE OIL PUMP ASSEMBLIES. THE GEAR IN THE OIL PUMPS WERE ALUMINUM. WE REPLACED THE AFFECTED PARTS AND ARE AT THIS TIME REASSEMBLING THE ENGS. WHEN WE FINISHED WITH THIS REPAIR; I WILL RETURN THIS ACFT BACK TO SVC.