# SDR UIEA2025111801310

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 20, 2025
- Submitted: November 21, 2025
- Operation: Air carrier
- Aircraft: [N249BA](https://openairdocs.org/aircraft/N249BA), registered now
- Make and model: Boeing 747409
- Aircraft serial: 24309
- Aircraft time: 88,550 hours, 16,833 cycles
- System (JASC): [5410 · Nacelle/Pylon, Main Frame](https://openairdocs.org/jasc/5410)
- Part: Cowl Door
- Condition: Corroded
- Location: Zone 400
- 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/UIEA2025111801310

## Discrepancy

CORROSION DAMAGED ON SKIN AND DOUBLER OF NO. 1 ENG LT CORE COWL, BETWEEN NAC STA 22.50 AND NAC STA 230.5 ON AFT SIDE OF PRECOOLER DUCT.(<P>1. ACCOMPLISHED EI NO: T2025A54M-2477 REV 2. 2. JOB COMPLETED AND CONDITION CHECK NORMAL.</P>)

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