# SDR 0101256641

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2001
- Submitted: April 6, 2001
- Operation: Air carrier
- Aircraft: N641NW
- Make and model: Boeing 747 212B
- Registry model: [Boeing 747 212B](https://openairdocs.org/model/boeing-747-212b) (OpenAirDocs)
- Aircraft serial: 21941
- Aircraft time: 73,576 hours, 16,053 cycles
- System (JASC): [5414 · Nacelle/Pylon, Plate/Skin](https://openairdocs.org/jasc/5414)
- Part: Skin
- Condition: Cracked
- Location: Nr 4 Pylon
- 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/0101256641

## Discrepancy

DURING H-CHECK, FOUND CRACK ON THE NUMBER 4 PYLON INBOARD STRUT SKIN.  REPAIRED PER EA 66-181950.

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