# SDR 200200167

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 23, 2002
- Submitted: January 23, 2002
- Operation: Air carrier
- Aircraft: N639FE
- Make and model: Boeing 747-2R7F
- Registry model: [Boeing 747-2R7F](https://openairdocs.org/model/boeing-747-2r7f) (OpenAirDocs)
- Aircraft serial: 21650
- Aircraft time: 64,833 hours, 15,038 cycles
- System (JASC): [5753 · Trailing Edge Flaps](https://openairdocs.org/jasc/5753)
- Part: Flap Track
- Part number: 65B170687
- Part serial: 1477
- Condition: Corroded
- Location: T/E Flap
- 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/200200167

## Discrepancy

SURFACE CORROSION, FLAP TRACK NR 4 ROLLER WAY.  THIS DOCUMENT PROVIDES REPAIR INSTRUCTIONS FOR CORROSION DAMAGE FOUND ON THE NR 4 FLAP TRACK LOWER ROLLER WAY SURFACES.  BLENDED OUT THE CORROSION PER OHM PROCEDURES WHILE MAINTAINING THE DRAWING FLATNESS AND PERPENDICULARITY REQUIREMENTS.  THIS REPAIR IS APPROVED BY THE BOEING COMPANY PER ECRA N639FE-57-B747-006-EAC.

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