# SDR USAA2011020990642

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2011
- Submitted: February 9, 2011
- Operation: Air carrier
- Aircraft: [N423US](https://openairdocs.org/aircraft/N423US), registered now
- Make and model: Boeing 737401
- Aircraft serial: 23990
- Aircraft time: 59,025 hours, 39,930 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Threshold
- Part number: 6547957U3
- 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/USAA2011020990642

## Discrepancy

CLT - Q3 - MAJOR REPAIR - LEVEL 2 EXFOLIATION CORROSION ON AFT CARGO DOOR THRESHOLD WEB BETWEEN BS 794 TO BS 847, RBL 25.  REPLACED AFT CARGO DOOR THRESHOLD WEB BETWEEN BS 794 TO BS 847, RBL 25 IAW B737 SRM 51-10-02 & 51-40-02.

---
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.