# SDR SWAA2026091033325

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2026
- Submitted: September 11, 2026
- Operation: Air carrier
- Aircraft: [N931WN](https://openairdocs.org/aircraft/N931WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36637
- Aircraft time: 56,214 hours, 34,452 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- 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/SWAA2026091033325

## Discrepancy

CORROSION FOUND ON TOP & UNDERSIDE AFT (WET AREA) FLOOR STRUCTURE AT RBL 41 BS 986 WL 208.    EVALUATED CORROSION ON BS986 RBL41 WL208 FLOORBEAM UPPER FLANGE ORIGINAL MATERIAL THICKNESS IS 0.150" LOWEST REMAINING MATERIAL IS 0.110" DAMAGE FOUND TO BE OUT LIMITS PER SRM 53-70-51-1A-1 ALLOWABLE DAMAGE 1 PAR 4.D(2)(A) FIGURE 103 /ALLOWABLE DAMAGE 1 DETAIL E

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