# SDR SWAA2025101413091

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 9, 2025
- Submitted: October 14, 2025
- Operation: Air carrier
- Aircraft: [N227WN](https://openairdocs.org/aircraft/N227WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 34450
- Aircraft time: 65,042 hours, 39,022 cycles
- System (JASC): [5740 · Wing, Attach Fittings](https://openairdocs.org/jasc/5740)
- Part: Nut Plate
- Condition: Corroded
- Location: Zone 600
- 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/SWAA2025101413091

## Discrepancy

CORROSION ON RAIL NUT PLATE LOCATED OFSS308 INTERNAL CAVITY LEADING EDGE AT RT WING.   EVALUATED RAIL NUT PLATE AND NOT FOUND ALLOWABLE DAMAGE ON SRM IAW SRM 57-20-01-1A-1 ALLOWABLE DAMAGE.  REPLACED RAIL NUT PLATE LOCATED OF SS308 INTERNAL CAVITY LEADING EDGE AT RT WING IAW SRM 51-40-02 AND MEASURES OF CORROSION ARE : L: 1.741 INCH W: 0.288 INCH.

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