# SDR EE4Y2025090323022

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 3, 2025
- Submitted: September 3, 2025
- Operation: General aviation
- Filed by: [Cooperativa Autogestionaria de Servicios Aeroindus, repair station EE4Y151M](https://openairdocs.org/faa-repair-station/EE4Y151M/cooperativa-autogestionaria-de-servicios-aeroindus.md) (OpenAirDocs)
- Aircraft: [N3159G](https://openairdocs.org/aircraft/N3159G), registered now
- Make and model: Boeing 737852
- Aircraft serial: 35119
- Aircraft time: 59,797 hours, 24,803 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- 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/EE4Y2025090323022

## Discrepancy

DURING THE ACCOMPLISHMENT OF 737-AE-53-837_P1-OP-UP NAC TASK CARD, IT WAS FOUND AT STA. 727F, THE FLOOR BEAM WITH SEVERAL CORROSION SPOTS BETWEEN LBL 60 AND RBL 60, SPECIFICALLY ON UPPER CHORD, UPPER AND LOWER SURFACES. SINCE THE MENTIONED FLOOR BEAM IS AFFECTED BY CARGO CONVERSION AS SHOWN IN AEI DWG AE8811. AEI WAS CONTACTED ASKING FOR REPAIR INSTRUCTIONS AND FINAL APPROVAL. THE CONDITION REPORTED WAS REPAIRED IAW AEI EO24870 (NAC EO 737-53-0402 REV. IR DTD 08/04/2025) AND APPROVED UNDER 8110-3.

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