What was found
DURING AIRCRAFT C-5 CHECK, LT WING L/E JUST OTBD OF NR 1 ENG, APPROX 4 INCHES, L/E PANEL APPEARS DEFORMED ON UPPER AND LOWER SURFACE. MAINTENANCE FOUND A CRACK ON THE NR 5 SLAT ASSY, LEADING EDGE SKIN AT OSS 389.71. INITIALLY, MAINTENANCE BEGAN TO REPAIR THE CRACK IAW SRM 57-43-01, REPAIR 2, BUT AFTER THE DAMAGE WAS CUT OUT, IT WAS DETERMINED THIS SRM REPAIR IS NOT APPLICABLE AT OSS 389.71. ENGINEERING WAS CONTACTED TO PROVIDE DIRECTION ON HOW TO PROCEED. THIS REA WILL DETAIL THE REPAIR STEPS NECESSARY TO INSTALL AN EXTERNAL REPAIR DOUBLER AS A PERMANENT REPAIR ON NR 5 SLAT ASSY, LEADING EDGE SKIN AT OSS 389.71.REPAIRED IAW REA ABX-REA-2780-66190-00.