What was found
MCN - MAJOR REPAIR - DURING C-20 CHECK A .375 INCH CRACK WAS FOUND IN STRINGER 16 LT AT BS 500C+4, FORWARD OF LEADING EDGE LIGHT. MAINTENANCE CUT OUT DAMAGE ON STRINGER 16 LT AND REMOVED STRINGER TIE CLIP AT BS 500C+4; FABRICATED A REPAIR CHANNEL, FILLER, AND NEW REPLACEMENT STRINGER TIE CLIP; INSTALLED REPAIR PARTS IAW AWA ER 03-5331-04073-ES1.