# SDR USAA2012042600013

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 11, 2012
- Submitted: April 30, 2012
- Operation: Air carrier
- Aircraft: N427US
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24549
- Aircraft time: 61,145 hours, 40,839 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/USAA2012042600013

## Discrepancy

Q1 CHECK - CORROSION ON THRESHOLD WEB BETWEEN BS 794 TO BS 847, S25R & BETWEEN RBL 19 TO RBL 29.  REPLACED THRESHOLD WEB BETWEEN BS 794 TO BS 847, S25R & BETWEEN RBL 19 TO RBL 29 IAW B737 SRM 51-40-02-0G, FIG 9 & 10.

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