# SDR SWAA2021031147303

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2021
- Submitted: March 11, 2021
- Operation: Air carrier
- Aircraft: N404WN
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 27892
- Aircraft time: 67,080 hours, 39,612 cycles
- System (JASC): [5310 · Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Web
- Condition: Corroded
- Location: Fuselage
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021031147303

## Discrepancy

***CORROSION*** ON CREASE BEAM WEB BS 680; RBL 69; WL 208 AROUND O/B AFT FASTENER / REMOVED CORROSION FROM CREASE BEAM WEB BS 680; RBL 69; WL 208; L=1.0' X W=0.9' X D=0.009' FOUND TO BE OUT OF LIMITS PER B737 SRM 53-40-13-1A-1. FORMED AND HEAT TREATED TO CONDITION T62 OSS P.O.#814926-SWA. REMOVED AND REINSTALLED CREASE BEAM WEB PER 51-40-02-0G-0 AND BOEING DWGS# 144A5920; 144A5900 AND 144A5901. APLIED CHEMICAL CONVERSION COATING AND PRIMER TO NEW CREASE BEAM WEB PER SOPM 20-43-03 AND 20-41-02. APPLIED CIC PER SOPM 20-41-05

---
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.