What was found
AIRCRAFT 9577, 7 EXPERIENCED A TAILSTRIKE UPON ARRIVAL INTO ATL. SKIN PANEL 5919707-521 AND THE EXTERNAL DOUBLER (PN P28538) ASSOCIATED WITH THE AFT ATG4 ANTENNA INSTALLATION (ASSY P19112-2005) WERE FOUND DAMAGED BETWEEN STA 974 TO STA 994 AND LONGERON 29L TO 30. CORRECTIVE ACTION: FABRICATED A REPLACEMENT EXTERNAL ATG4 MOD DOUBLER (FIG. 1, ITEM 50), AND REPLACEMENT INTERNAL ATG4 MOD DOUBLER (FIG. 1, ITEM 100) FROM 0.071 THICK 2024-T3 CLAD SHEET, ENLARGED TO FIT THE FASTENER PATTERN SHOWN IN FIGURE 4. FABRICATED A REPLACEMENT SKIN CUTOUT FILLER (FIG. 1, ITEM 90) FROM 0.063 THICK 2024-T3 CLAD SHEET ENLARGED TO FIT THE DAMAGE CUTOUT. (LP 2172254)