# SDR DALA2026060903451

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2026
- Submitted: June 9, 2026
- Operation: Air carrier
- Aircraft: [N587NW](https://openairdocs.org/aircraft/N587NW), registered now
- Make and model: Boeing 757351
- Aircraft serial: 32986
- Aircraft time: 77,584 hours, 25,308 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Condition: Corroded
- Location: Zone 200
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2026060903451

## Discrepancy

CORROSION OUT OF LIMITS IN REF NRC 00459: UT) MEASUREMENT THICKNESS WAS ACOMPLISHED ON ANGLE FLOOR SUPPORT STA 976 TO 1040 STGR 17L OF AREA ABOVE WING CENTER SECTION ORIGINAL THICKNESS 0.070IN AND MINIMUM REMAINING THICKNESS IS 0.033IN THEREFORE IT IS OUT OF LIMITS PER B757-300 SRM 53-40-13-1A PROCEDURE 1, DETAIL VII.   CORROSION LEVEL 2: ANGLE FLOOR SUPPORT STA 976 TO 1040 STGR 17L OF AREA ABOVE WING CENTER WAS REPLACED PER B757-300 SRM 51-40-02-0G (1636264) AIRCRAFT WAS GROUNDED

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