# SDR SWAA2020051845177

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 25, 2020
- Submitted: May 18, 2020
- Operation: Air carrier
- Aircraft: [N472WN](https://openairdocs.org/aircraft/N472WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33831
- Aircraft time: 55,520 hours, 32,985 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Condition: Corroded
- Location: Fuselage
- 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/SWAA2020051845177

## Discrepancy

***CORROSION*** ON SUBTHRESHOLD WEB AT ACB BS796 - BS847 RBL23 WL161. / REMOVED CORROSION FROM ACB SUBTHRESHOLD WEB BS796-847 RBL-23 MORE THAN 50% MATERIAL LOST ORIGINAL MATERIAL THICKNESS 0.045' FOUND TO BE OUT OF LIMIT IAW SRM 53-60-15-1A-1 LOCATED AND DRILLED NEW WEB ITEM #7531818 IAW SRM 51-40-05-0G-0 AND DRW# 146A8120 AND INSTALLED IAW SRM 51-40-02-0G-0 AND DWG# 146A8120

---
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.