# SDR UPS99428334

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N691UP](https://openairdocs.org/aircraft/N691UP), registered now
- Make and model: Boeing 747121
- Aircraft serial: 19641
- System (JASC): [5712 · Wing, Rib/Bulkhead](https://openairdocs.org/jasc/5712)
- Part: Rib
- Part number: 65B078495
- Condition: Cracked
- Location: Lt Wing
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS99428334

## Discrepancy

INSPECTION TYPE N/A, AFTER REMOVAL OF LT OTBD LEADING EDGE UPPER PANEL, FOUND 7TH L/E RIB FROM OTBD END, UPPER CHORD CRACKED.  REMOVED AND REPLACED RIB IAW SRM 51-30-2, 51-10-6, 51-10-1.

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