What was found
EXTERIOR FUSELAGE SKIN HAS 5 CRACK INDICATIONS ON STR 4R CHEM MILL AREA AT STA 342, 401, 403, 405, 406. SUPPLEMENTAL DATA UPDATE ACCOMPLISHED CROWN INSPECTION PER NDT53-30-14 AND FOLLOW UP INSPECTIONS PER SAME MM FOR CRACK INDICATIONS. NO EVIDENCE OF CONDUCTIVITY CHANGE. VISUAL INSPECTION FOUND NO EVIDENCE OF CRACKS ON INNER OR OUTER SURFACES. HFEC INNER SKIN IN CHEM MILL AREAS WHERE CRACKS WERE INDICATED WITH SLIDING PROBE. NO CRACKS WERE FOUND.