What was found
HFEC SURFACE INDICATION OF DEFECT(CRACK)NOTED AND MARKED IN RED SHARPIE ON FUSELAGE MAIN FRAME 1640RIGHT HAND SIDE INNER CHORD FWD RETURN FLANGE RADIUS INLINE WITH STRINGER 14R. INDICATION RUNS FROM EDGE OF FLANGE UNDER STRAP TO SINGLE FASTENER ATTACHED TO FRAME AND STRNGER. LFEC INDICATION CONFIRMS HFEC INDICATION AT STR 14R FOR STEP 3.D OF TASK CARD. CRACK RUNS UNDER STRAP TO FASTENER. REPAIR AS REQUIRED. COMPLIED WITH EA # F-5310-T0357026, FUSELAGE MAINFRAME STA. 1640 FRAME SPLICE REPAIR BETWEEN STRINGER I-9F AND S-20R.