# SDR UPS03440542

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 6, 2003
- Submitted: April 30, 2003
- Operation: Air carrier
- Aircraft: N681UP
- Make and model: Boeing 747121
- Aircraft serial: 19661
- Aircraft time: 100,611 hours, 25,820 cycles
- System (JASC): [5711 · Wing Spar](https://openairdocs.org/jasc/5711)
- Part: Spar
- Condition: Corroded
- Location: Nr 4 Slat
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS03440542

## Discrepancy

INSPECTION TYPE: C,  LT WING UPPER SURFACE FRONT SPAR RABBET PANEL FOUND BULGE AT NR 4 SLAT O/B AREA AS MARKED.     LT WING UPPER SURFACE FRONT SPAR REPAIRED AS RS R57-25-35006 AND ENGINEERING FILE NUMBER : 747-57-20040 AT NR 4 SLAT O/B AREA WS 1294.

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