# SDR 9810296635

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 22, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N635US
- Make and model: Boeing 747227B
- Aircraft serial: 21682
- System (JASC): [5400 · Nacelle/Pylon Structure](https://openairdocs.org/jasc/5400)
- Part: Channel
- Condition: Cracked
- Location: Nr 4 Pylon
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9810296635

## Discrepancy

DURING PERIODIC CHECK, FOUND CRACK IN STIFFENER FLANGE ON NR 4 PYLON BL 0, FS 157.  REPAIRED PER EA 66-160980, REV A.

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