What was found
DURING ACCOMPLISHMENT OF AD 90-26-09 / SB727-53-0084, FOUND INTERNAL SKIN AT BS 478 ABOVE S4L HAS CORROSION. REMOVED CORROSION IAW B727 SRM 51-10-6. FOUND TO BE OUT OF LIMITS IAW B727 SRM 53-10-1. ULTRASONIC THICKNESS CHECK MINIMUM NOMINAL .034 TO .036. HFEC INSP C/W NO DEFECTS NOTED. REPAIRED PER PART III OF BOEING S/B 727-53-0084 REV 4 IAW BOEING DRAWING 69-62161 SHEET 3. NON-ROUTINE TASK CARD NUMBERS 114557 AND 114796. AMERICAN INTERNATIONAL AIRWAYS INC (B4MR567J) ACCOMPLISHING COOK AIRCRAFT LEASING WORKSCOPE FOR PURCHASE UPON COMPLETION.