# SDR SWAA2026062211588

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2026
- Submitted: June 23, 2026
- Operation: Air carrier
- Aircraft: [N478WN](https://openairdocs.org/aircraft/N478WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33989
- Aircraft time: 71,646 hours, 43,008 cycles
- System (JASC): [5531 · Vertical Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5531)
- Part: Rib
- Part number: 174A11081
- Condition: Cracked
- Location: Zone 300
- 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/SWAA2026062211588

## Discrepancy

UPON INSTALL OF DORSAL FIN; FOUND FORWARD MOUNT POINT(S) BRACKET CRACKED.  APPLIED ALODINE IAW SRM 51-20-01.  REMOVED CRACKED RIB IAW SRM 51-40-02 FABRICATED A NEW -1 RIB IAW DWG 174A1108 REV -, LOCATED AND DRILLED RIB IAW DWG 174A1008, REV B AND SRM 51-40-10. ALODINED AND PRIMED IAW SRM 51 -20-01.

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