# SDR 0300166718

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2003
- Submitted: February 6, 2003
- Operation: Air carrier
- Aircraft: [N618US](https://openairdocs.org/aircraft/N618US), registered now
- Make and model: Boeing 747251F
- Aircraft serial: 21122
- Aircraft time: 90,520 hours, 22,730 cycles
- System (JASC): [5412 · Nacelle/Pylon, Bulkhead/Firewall](https://openairdocs.org/jasc/5412)
- Part: Bulkhead
- Condition: Cracked
- 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/0300166718

## Discrepancy

During "L" check found crack on #4 pylon rear engine mount bulkhead. Repaired per EA 67-165031.

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