# SDR KCSA202512091236

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2025
- Submitted: December 9, 2025
- Operation: Air carrier
- Aircraft: [N740CK](https://openairdocs.org/aircraft/N740CK), registered now
- Make and model: Boeing 747-4H6
- Registry model: [Boeing 747-4H6](https://openairdocs.org/model/boeing-747-4h6) (OpenAirDocs)
- Aircraft serial: 24405
- Aircraft time: 109,500 hours, 18,568 cycles
- System (JASC): [2810 · Fuel Storage](https://openairdocs.org/jasc/2810)
- Part: Skin
- Condition: Corroded
- Location: Fuel Tank
- 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/KCSA202512091236

## Discrepancy

CORROSION FOUND ON FUEL CTR TANK ON UPPER SKIN MAIN W/W UPPER SURFACE MAIN DECK STA 1241 LBL 2

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