# SDR 0501916624

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2005
- Submitted: January 5, 2006
- Operation: Air carrier
- Aircraft: [N624US](https://openairdocs.org/aircraft/N624US), registered now
- Make and model: Boeing 747251B
- Aircraft serial: 21706
- Aircraft time: 98,128 hours, 17,045 cycles
- System (JASC): [5420 · Nacelle/Pylon Miscellaneous Structure](https://openairdocs.org/jasc/5420)
- Part: Stiffener
- 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/0501916624

## Discrepancy

DURING "M" CHECK, FOUND CRACK IN INBOARD STIFFENER OF NR 4 PYLON AT NAC STA 217.  REPAIRED PER EA 66-205836.

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