What was found
NR 4 RT STUB WING INTERNAL DOUBLER CRACK STA XFS 523.000 (MAJOR REPAIR) AND NON STANDARD REPAIR (EXTERNAL DOUBLER) ALSO CORRODED. PERFORMED MAJOR REPAIR IAW SRM 57-2-1A FIG 1. REMOVED EXISTING EXTERNAL DOUBLER AND CRACKED INTERNAL DOUBLER IAW SRM 51-1-21, SRM 51-1-20D. FABRICATED EXTERNAL REPAIR DOUBLER (AL7075T6 0.080") AND INTERNAL DOUBLER (AL7075"0" 0.063") IAW SRM 57-2-1A FIG 1. HEAT TREATED INTERNAL DOUBLER FROM 7075"0" TO 7075T6 IAW SRM 51-1-1 PG 1,13,17. CLEANED, TREATED AND PRIMED AREA AND REPAIR PARTS IAW SRM 51-1-8B. APPLIED SEALANT TO FAYING SURFACES IAW SRM 51-1-11. INSTALLED REPAIR PARTS IAW SRM 57-2-1A FIG 1, SRM 51-1-20D, SRM 51-3-1.