A B777-200ER WAS DISPATCHED IN NON COMPLIANCE WITH A #13 SPOILER PWR CTL UNTIL REPLACED WITHOUT THE REQUIRED INSPECTION ACCOMPLISHED.

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DURING TROUBLESHOOTING OF 'SPOILER' EICAS MESSAGE; #13 SPOILER PCU WAS REPLACED PER MAINT MANUAL. (SHIP XYZ.) THIS OCCURRED OCT/MON/99; AROUND XA00-XD00. THE PLANE WAS SUBSEQUENTLY RELEASED AND FLEW WITHOUT INCIDENT. LATER OCT/TUE/99 AFTERNOON IT WAS BROUGHT TO MY ATTN THAT THE LIST OF RII (REQUIRED INSPECTION ITEMS) HAD CHANGED LAST APR/XA/99; IN OUR TOPP (TECHNICAL OPS POLICY AND PROC MANUAL); AND WHERE NO RII WAS REQUIRED PREVIOUSLY FOR REPLACEMENT IN A LINE MAINT SIT; IT NOW WAS REQUIRED. UPON DISCOVERY OF OUR OMISSION; I SET UP TO HAVE THE INSPECTION PERFORMED BY QUALITY ASSURANCE DURING ITS NEXT TRANSIT TO ZZZ; OCT/WED/99. THE INSPECTION WAS PERFORMED AND DOCUMENTED IN ACFT LOGBOOK. I ALSO INITIATED A MAINT ADVISORY TO BRING HEIGHTENED AWARENESS TO THE RII CHANGE. NORMALLY CHANGES TO TOPPS ARE A 'READ AND SIGN;' SO ALL ARE AWARE OF THE CHANGE. IN MY CASE; I HAD BEEN INVOLVED WITH THE B777 PROGRAM; HAD NO 'READ AND SIGNS' FOR ABOUT THE LAST YR; AND WAS UNAWARE OF THE CHANGE. A CONTRIBUTING FACTOR WOULD BE NO INSPECTION OR RII CALLED FOR IN MAINT MANUAL.