What was found
DURING HEAVY MAINTENANCE: CORROSION FLOOR STRUCTURE ON UPPER SURFACE OF THE UPPER SKIN OF THE C ENTER WING BOX FR41 TO FR42 ON LH SIDE IN PASSENGER CABIN (CPCP RELATE D REFER MPD TASK 571157-01); REF AEROMAN NR 2023-631067 WO 2023 358/1 PERFORMED PERMANENT REPAIR ON FLOOR STRUCTURE UPPER SURFACE OF THE UPPER SKIN OF THE CENTER WING BOX FR 41 TO FR 42 ON LH SIDE IN PASSENGER CABIN IAW EA 57-0384-23. AND EC A23-1115-01 TOOL USED: DIGITAL CALIPER P/N: 500-172-20, S/N: 116040, DUE DATE: MAR-29-2024. CALIPER P/N: 500-464 S/N: B17030934 DUE DATE: DEC-19-2023. ULTRASONIC GAGE P/N: 45MG, S/N: 221861811, DUE DATE: NOV-08-2023. EDDY CURRENT P/N: NORTEC 500D, S/N: 00X12101V022237, DUE DATE: JAN-26-2024. DIGITAL CALIPER P/N: 500-196-30, S/N: A21029144, DUE DATE: AUG-04-2024. DIGITAL CALIPER P/N: 500-197-30 S/N: A21147756 DUE DATE: NOV-07-2023. ELECTRONIC DEPTH GAUGE P/N: 8645A12 S/N: 72677 DUE DATE: JUL-23-2024. DIGITAL CALIPER P/N: 500-197-30 S/N: B20189443 DUE DATE: DEC-27-2023. DONE BY F. FLORES 8652908 (CONSIDERED AS A MAJOR REPAIR)