What was found
LT INBOARD AILERON L/E UPPER SKIN SURFACE WITH 0.500 INCH CRACK AT STA XA.502.000 (MAJOR REPAIR). PERFORMED MAJOR REPAIR IAW SRM 57-1-0 PG 1, SRM 57-8-1 PG 2. REMOVED UPPER SKIN ON LT INBOARD AILERON L/E STA XA. 502.000 IAW SRM 51-1-21 PG 1. FABRICATED NEW SKIN (7075-T6 0.040) IAW SRM 57-8-1 PG 2. CLEANED, TREATED AND PRIMED INNER SKIN IAW SRM 51-1-8B. INSTALLED NEW SKIN ON LT INBOARD AILERON L/E IAW SRM 57-8-1 PG 2 , SRM 51-1-21 PG 1, SRM 51-1-15 PG 1 FOR REMOVAL/INSTALLATION SEE N/R 2152 AND REBALANCE SEE N/R 2658.