What was found
R.HAND LOWER WING PLANK ACCESS PANEL 640BB HAS FRETTING CORROSION. ***AIRCRAFT REMOVED FROM SERVICE*** REMOVED CORROSION AT LOWER WING PLANK ACCESS AT PANEL 640BB REF. CRJ200 SRM 51-21-06, REV.38. PERFORMED UT THICKESS MEASUREMENT, MINIMUM REMAINING THICKNESS OF PLANK CIRCUMFERENCE 0.172Ï¿½, REF. EA# AWAC-CRJ257-01576 REV.(IR) DATED: 02-17-2021 AND CRJ 200 NDTM PART (4) 51-00-001. UT GAUGE S/N 151136107 CAL DUE: 09-16-2021. PERFORMED HFEC INSPECTION ON WING PLANK ACCESS AT PANEL 640BB REF. REF. EA# AWAC-CRJ257-01576 REV.(IR) DATED: 02-17-2021 AND CRJ 200 NDTM PART (1) 51-20-06, REV (42). NO INDICATION NOTED. ET TESTER S/N: 60007150515 CAL DUE: 10-09-2021. ROTO PEENED LOWER WING PLANK ACCESS AT PANEL 640BB REF. EA# AWAC-CRJ257-01576 REV.(IR) DATED: 02-17-2021. APPLIED SURFACE PROTECTION ON LOWER WING PLANK ACCESS AT PANEL 640BB REF. CRJ 200 SRM 51-25-06, REV. 38. BONDING CHECK GOOD REF. CRJ 200 AMM 51-80-00. LEAK CHECK GOOD REF. CRJ 200 AMM 28-11-00-780-802.