# SDR AALA202609029004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 9, 2026
- Submitted: September 2, 2026
- Operation: Air carrier
- Aircraft: [N904AN](https://openairdocs.org/aircraft/N904AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29506
- Aircraft time: 71,361 hours, 29,891 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Part number: 146A940321
- Condition: Corroded
- Location: Zone 200
- 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/AALA202609029004

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: FOUND CORROSION ON INTERCOSTAL BETWEEN FS 787 AND FS 807 AT STR 21L.   REMOVED AND REPLACED INTERCOSTAL PN 146A9403-21 IAW AARD 51-00-05 AND BOEING DWGS 146A9401, AND 146A7550.

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