AN MD88 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT RUDDER LIMITER ACTUATOR INSTALLED.

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WHILE WORKING ACFT Y INBOUND WRITE-UP 'UNRESTR RUDDER LIGHT FAILS TO COME ON UNTIL BELOW 144 KTS.' -- REMOVED AND REPLACED RUDDER LIMITER ACTUATOR ASSEMBLY. -- INSTALLED INCORRECT MANUFACTURER PART NUMBER Z EFFECTIVE FOR SHIPS X THROUGH Z. SHOULD HAVE INSTALLED MANUFACTURER PART NUMBER X OR Y. EFFECTIVE FOR SHIPS A-B. -- ADJUSTMENT TEST OF RUDDER SYSTEM MAINT MANUAL 27-20-06-201-2 WAS USED EFFECTIVE FOR A-B. -- THERE IS VISUALLY NO DIFFERENCE IN THE PARTS. -- THE ACR X REPAIR SHOP FOR THIS PART NOTICED THE EFFECTIVITY DIFFERENCES WHEN REPAIRING THE REMOVED ASSEMBLY. -- THE ACFT WAS RETURNED TO SVC WITH NO OTHER TROUBLE FROM THE RUDDER SYS. -- THE ACFT WAS ROUTED BACK FOR LIMITER ASSEMBLY REPLACEMENT UPON THE DISCOVERY OF THE INEFFECTIVE ASSEMBLY ON THE ACFT. ON AUG/FRI/03; I WAS INFORMED OF THE DISCREPANCY ON THIS DATE. SUPPLEMENTAL 591385: TO MY UNDERSTANDING; MY COMPANY IS CURRENTLY WORKING ON SOLUTIONS WITH THE COMPUTER PROGRAMS USED FOR THE M/M; IPC; AND PARTS ORDERING SYS TO AID IN PREVENTING THIS TYPE OF EVENT FROM HAPPENING. IN THE FUTURE; I WILL PERSONALLY REQUIRE THE IPC REF TO BE AVAILABLE DURING R11 OK TO INSTALL INSPECTIONS.