# SDR USAA2012101500011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 12, 2012
- Submitted: October 16, 2012
- Operation: Air carrier
- Aircraft: N421US
- Make and model: Boeing 737401
- Aircraft serial: 23988
- Aircraft time: 63,340 hours, 42,357 cycles
- System (JASC): [5714 · Wing, Center Box](https://openairdocs.org/jasc/5714)
- Part: Stiffener
- Part number: 65C300362
- Condition: Cracked
- Location: Center Wing
- 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/USAA2012101500011

## Discrepancy

C2 CHECK - CRACK ON WING CENTER SECTION VERTICAL STIFFENER AT BS 663.15, WL 170.4, RBL 6.15. WING CENTER SECTION VERTICAL STIFFENER AT BS 663.15, WL 170.4, RBL 6.15 IAW EO 5704V245 & EA 104233.

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