# SDR CALA2026011212873

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 8, 2026
- Submitted: January 12, 2026
- Operation: Air carrier
- Aircraft: [N54241](https://openairdocs.org/aircraft/N54241), registered now
- Make and model: Boeing 737824
- Aircraft serial: 28953
- Aircraft time: 79,178 hours, 29,560 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Part number: 147A576213
- 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/CALA2026011212873

## Discrepancy

MAIN CABIN AFT WET AREA, INTERCOSTAL HAS CORROSION ON UPPER SURFACE BETWEEN BS 947.5 AND BS 967 APPROX RBL50.  REMOVED CORROSION FROM INTERCOSTAL, UPPER SURFACE, ORIGINAL THICKNESS .125", MATERIAL REMOVED .074", REMAINING MATERIAL .051", FOUND TO BE OUT OF SRM LIMITS IAW B737 SRM 53-70-51. REMOVED AND REPLACED INTERCOSTAL IAW B737 DWG NO. 147A5760 REV- .

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