# SDR 0104256642

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2001
- Submitted: November 20, 2001
- Operation: Air carrier
- Aircraft: N642NW
- Make and model: Boeing 747 212B
- Registry model: [Boeing 747 212B](https://openairdocs.org/model/boeing-747-212b) (OpenAirDocs)
- Aircraft serial: 21942
- Aircraft time: 73,739 hours, 16,575 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- Condition: Corroded
- Location: Fuselage
- 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/0104256642

## Discrepancy

DURING "H" CHECK FOUND CORROSION ON UPPER DECK FLOORBEAM UPPER CHORD AT BS 500 LBL 46.  REPAIRED PER EA 66-186643.

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