What was found
DURING ROUTINE PREFLIGHT INSPECTION, FOUND THE FUSELAGE EXTERNAL PLATING WITH CORROSION BULGE, TWO MISSING RIVET HEADS AND THREE CRACKS MIGRATING FROM ONE MISSING RIVET HEADS BETWEEN FUSELAGE STATION -21.0 TO 30.0 BETWEEN LONGERON 31 RIGHT AND 35 LEFT. THE AIRCRAFT VISITED HEAVY MAINTENANCE FOR REPAIRS. REPAIR ACCOMPLISHED CORROSION REMOVAL, FABRICATION AND INSTALLATION AN INTERNAL FILLER, TWO INTERNAL SPLICE DOUBLERS, AND EXTERNAL REPAIR DOUBLERS IN ACCORDANCE WITH DOUGLAS FAX FILE NUMBER 98-10-08-009 AND DOUGLAS STRUCTUAL REPAIR MANUAL.