# SDR WRNA200700034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 14, 2007
- Submitted: June 14, 2007
- Operation: Air carrier
- Aircraft: [N526UP](https://openairdocs.org/aircraft/N526UP), registered now
- Make and model: Boeing 747 212B
- Registry model: [Boeing 747 212B](https://openairdocs.org/model/boeing-747-212b) (OpenAirDocs)
- Aircraft serial: 21937
- Aircraft time: 89,777 hours, 16,916 cycles
- System (JASC): [5730 · Wing, Plate/Skin](https://openairdocs.org/jasc/5730)
- Part: Rib
- Condition: Cracked
- Location: Nr 4 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/WRNA200700034

## Discrepancy

DURING C-CHECK, THE LOWER RIB CORD OF NR 4 FUEL TANK ACCESS PANEL 652AB, WS 972 WAS FOUND CRACKED FROM RADIUS BLOCK TO RADIUS BLOCK.   REMOVED LOWER RIB CORD IAW SRM 51-30-00, FABRICATED NEW RIB CORD IAW DRAWING 65B01073 AND INSTALLED RIB CORD IAW SRM 51-30-02.

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