What was found
DURING ROUTINE INSPECTION OF NR 1 AND NR 4 PYLONS, CRACKS WERE DISCOVERED IN THE RT UPPER TEE CHORD, FORWARD HORIZONTAL FLANGE, NACELLE STA 270. CRACK LENGTH IN NR 1 PYLON WAS 2.25 INCHES, NR 4 PYLON WAS 1.25 INCHES. REPAIRS ACCOMPLISHED IAW KLM DATA FAX 99-088 AND BOEING TELEX NR TLS-AMS-99-0091TE; TLS-AMS-99-00021H; IN ADDITION TO SB 747-54-2125, AND DLM ENGINEERING AND MAINTENANCE REPORT NR KLM 990714. FORM 8110-3 ISSUED. REF: OPER CNTRL NR UIEA99059.