A DC10-10 WAS DISPATCHED AND OPERATED IN NON COMPLIANCE WITH LOWER FUSELAGE SKIN CORROSION BEYOND ALLOWABLE TIME LIMITS.

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ON SEP/XA/99 AT XC30; RECEIVED A CALL FROM MAINT IN ZZZ IN REGARDS TO A DEFERRED ITEM ON A DC10-10. ITEM WAS PREVIOUSLY DEFERRED BACK ON AUG/XC/99 IN ZZZ. THE ITEM CONCERNED A QUILTED SKIN AND SOME MINOR CORROSION AND ONE DISHED RIVET HEAD. I AUTH THE DEFERRAL AT THE TIME PER OUR MAINT MANUAL TO THE NEXT MAINT CHK WITH THE CONDITION THAT THE AREA BE RECHKED AT THE NEXT 'A' CHK. 90 FLT HRS LATER; THE ACFT WAS BACK IN ZZZ AND AREA WAS RECHKED AND FOUND TO BE ACCEPTABLE. ACFT WAS IN ZZZ ON SEP/YY/99 FOR A MAINT CHK. ZZZ MAINT CALLED ME TO BREAK OR EXTEND THE DEFERRAL ON THIS ITEM. AFTER REVIEWING THE DEFERRAL AGAIN; I REALIZED I HAD ERRED IN MY ORIGINAL AUTH FOR DEFERRAL. THE DISCREPANCY SHOULD HAVE BEEN DEFERRED FOR 100 HRS VERSUS LETTING THE CONDITION CONTINUE UNTIL MAINT CHK. ZZZ ACCOMPLISHED A REPAIR WITH ENGINEERING ASSISTANCE AND ACFT CONTINUED ON WITH A NEW DEFERRAL. IN QUICK HASTE; I MUST'VE AUTH THE ORIGINAL DEFERRAL TO MAINT CHK MISINTERPING THE SET GUIDELINES IN THE MAINT MANUAL SPECS. THE DEFERRAL SHOULD'VE BEEN JUST FOR 100 HRS FOR ENGINEERING TO RE-EVALUATE.