# SDR UIEA02007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 11, 2002
- Submitted: February 28, 2002
- 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): [5711 · Wing Spar](https://openairdocs.org/jasc/5711)
- Part: Spar
- Condition: Corroded
- Location: Wing
- 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/UIEA02007

## Discrepancy

DURING CURRENT C-CHECK AT KLM/AMS, FOUND LEVEL 1 CORROSION ON THE L/W VERTICAL FLANGE OF THE LOWER FRONT SPAR CHORD BETWEEN ILES 630.72 AND 638 (INBOARD OF NR 2 PYLON).  TAPER LOCK FASTENERS IN THE AFFECTED AREA WERE REMOVED.  CORROSION BLENDED AND FASTENER HOLES WERE REAMED AND SPOT FACED TO ENSURE A STRAIGHT HOLE AND FLAT CONTACT AREA.  MATERIAL LOSS MEASURED AT .150 INCH.  AN OPEN HOLE HFEC, DYE CHECK AND SURFACE HFEC INSPECTION WAS PERFORMED TO INSURE NO CRACKS/CORROSION REMAINED.  NO FINDINGS.  AREA FLAP PEENED, ALODINED AND PRIME PAINTED.  OVER-SIZED HI-LOCK FASTENERS INSTALLED WET WITH BMS 5-26 SEALANT.  TANK SEALED.  (M)

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