What was found
BLENDED OUT THE CORROSION TO A 20:1 RATIO. VERIFIED CORROSION FREE USING 10X VISUAL INSPECTION. REMOVED FASTENERS IN REPAIR AREA. FLAT PEEN BLENDOUT AREA. ALODINED AND TWO COATS BMS 10-20 TYPE II PRIMER TO BLEND AND SPOT FACE AREAS. INSTALLED 1/32 INCH OVERSIZE PROTRUDING TENSION HEAD HI-LOCKS WET WITH BMS 5026 TYPE II IN COLD WORKED TRANSITION FIT HOLES. REPAIR COMPLETED IAW ECO 3397. AIRCRAFT RETURNED TO SERVICE. CENTER FUEL TANK LOWER PANEL P/N 6545403, BS 638.60 AT STRINGER 4C WAS REPAIRED.(M)