# SDR CALA2025100709735

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 4, 2025
- Submitted: October 7, 2025
- Operation: Air carrier
- Aircraft: [N75435](https://openairdocs.org/aircraft/N75435), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 33529
- Aircraft time: 51,181 hours, 18,376 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Part number: 141A56901
- 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/CALA2025100709735

## Discrepancy

MAIN CABIN FLOOR SUPPORT INTERCOSTAL FLOOR BOARD FASTENER HOLES 2EA HAVE CORROSION IN THE BORE BETWEEN STA 294.5 AND 312 AT APPROX LBL12.   MAIN CABIN FLOOR STA 294.5 - 312 LBL 11.1 BLENDED AFFECTED AREA ON INTERCOSTAL TO REMOVED CORROSION,  REMAINING MATERIAL FOUND TO BE BEYOND LIMITS IAW BOEING SRM 53-10-51.  REMOVED AND REPLACED INTERCOSTAL IAW BOEING DWG 141A5600 REV:N SHEET 2 AND SRM 51-40-02.

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