# SDR SWAA2026091009965

- 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/SWAA2026091009965

## Discrepancy

CORROSION FOUND ON TOP & UNDERSIDE AFT (WET AREA) FLOOR STRUCTURE AT RBL 35 BS 986 WL 208  {MARKED} {PICTURES UPLOADED} EVALUATED CORROSION ON BS986 RBL35 WL208 FLOOR BEAM UPPER FLANGE ORIGINAL MATERIAL THICKNESS IS 0.150" LOWEST REMAINING MATERIAL IS 0.120" 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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