What was found
LEFT WING LOWER WING PLANK ACCESS HOLE CUT-OUT AT PANEL 540BB HAS FRETTING CORROSION AT SEVERAL LOCATIONS AROUND CIRCUMFERENCE. INITIATE AWAC E06/021-457 CURRENT REVISION. ***AIRCRAFT REMOVED FROM SERVICE*** REMOVED FRETTING CORROSION ON INBOARD (P1) AND OUTBOARD (P2) FLANGE OF PANEL 540BB ACCESS HOLE. P1) 10.200Ï¿½L X 0.500Ï¿½W X 0.016Ï¿½ D, REMAINING 0.166Ï¿½. P2) 8.400Ï¿½L X 0.500Ï¿½W X 0.011Ï¿½D, REMAINING 0.171Ï¿½. BLENDED AREAS WITHIN LIMITS, HFEC PERFORMED WITH NO INDICATIONS ROTO PEENED AND PROTECTIVE FINISH RESTORED, REF EO#E06/021/457 REV D DATED12/20/2018 AND REO 601-57-21-030 REV L DATED 2014/02/05.