# SDR SWAA2021122251491

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2021
- Submitted: December 22, 2021
- Operation: Air carrier
- Aircraft: [N910WN](https://openairdocs.org/aircraft/N910WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36618
- Aircraft time: 45,600 hours, 27,244 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Condition: Corroded
- Location: Threshold
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021122251491

## Discrepancy

CORROSION ON SUBTHRESHOLD WEB AT FWD CARGO BAY BS455 - BS481 RBL28. ; / [01] EVALUATED CORROSION ON WEB BS 455-481 RBL 28 WL 156 FOUND DEEPEST AREA OF 0.015 REMOVED FROM ORIG 0.045 FOUND TO BE OUT OF LIMITS PER SRM 53-30-15-1A-1 USING DIAL DEPTH GAUGE ATS 2678 S/N UNKNOWN; [02] VERIFIED CORRECTIVE ACTION ENTRY 1; [03] LOCATED AND DRILLED NEW SUBTHRESHOLD WEB BS455-BS481 RBL 28 IAW SRM 51-40-050G-0; DWG 143A8330; DWG 143A8330 DWG 143A8120; [04] VERIFIED LOCATED AND DRILLED NEW SUBTHRESHOLD WEB BS455-BS481 RBL 28 IAW SRM 51-40-050G-0; DWG 143A8330; DWG 143A8330 DWG 143A8120; [05] VERIFIED FCB DOOR CUTOUT THRESHOLD WEB WILL BE INSTALLED IN FAULT TTG8Q004DVYU.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.