# SDR USAA2010021590383

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 8, 2010
- Submitted: February 17, 2010
- Operation: Air carrier
- Aircraft: N453UW
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24980
- Aircraft time: 51,493 hours, 34,233 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Angle
- 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/USAA2010021590383

## Discrepancy

CLT - MAJOR REPAIR - Q5 CHECK - LEVEL 2 EXFOLIATION CORROSION ON THE AFT ENTRY DOOR SILL Z-ANGLE AT BS 96 - BS 990, LBL 45.  REPLACED THE AFT ENTRY DOOR SILL Z-ANGLE AT BS 96 - BS 990, LBL 45 IAW B737 SRM 51-10-02.

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