# SDR UIEA200500027

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 18, 2005
- Submitted: April 15, 2005
- Operation: Air carrier
- Aircraft: [N527MC](https://openairdocs.org/aircraft/N527MC), registered now
- Make and model: Boeing 747-2D7B
- Registry model: [Boeing 747-2D7B](https://openairdocs.org/model/boeing-747-2d7b) (OpenAirDocs)
- Aircraft serial: 22471
- System (JASC): [5411 · Nacelle/Pylon, Frame/Spar/Rib](https://openairdocs.org/jasc/5411)
- Part: Spar
- Part number: 65B940513
- Condition: Cracked
- Location: Nr 3 Pylon
- 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/UIEA200500027

## Discrepancy

DURING SCHEDULED MAINTENANCE, NR 3 PYLON INBOARD MIDSPAR CHORD WAS FOUND CRACKED ON THE VERTICAL FLANGE.  THE AFFECTED SECTION OF CHORD WAS TRIMMED OUT.  NDT INSPECTION WAS PERFORMED AT TRIMMED EDGES AND AT AL AFFECTED FASTENERS LOCATION TO ENDURE A CRACK AND DAMAGE FREE CONDITION.  A NEW SECTION OF CHORD REPLACEMENT WAS INSTALLED USING REPAIR SPLICE STRIPS AND FILLERS.  THE REPAIR ASSEMBLY CONFORMS TO DESIGN REQUIREMENTS.  (M)

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