# SDR QXEA0000646

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 2, 2000
- Submitted: April 13, 2000
- Operation: Air carrier
- Aircraft: [N478US](https://openairdocs.org/aircraft/N478US), registered now
- Make and model: Fokker F.28 MK4000
- Registry model: [Fokker F.28 MK4000](https://openairdocs.org/model/fokker-f-28-mk4000) (OpenAirDocs)
- Aircraft serial: 11227
- Aircraft time: 30,576 hours, 37,630 cycles
- System (JASC): [5531 · Vertical Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5531)
- Part: Rib
- Condition: Cracked
- Location: Vertical Stab
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QXEA0000646

## Discrepancy

PDX - VERTICAL STAB RIB 3.2 HAS A CRACKED LEFT LOWER FLANGE AT AFT END, SEVERAL CRACKS EXTEND THROUGH AND CONNECT APPROXIMATELY FOUR RIVET HOLES.  REPAIRED IAW HORIZON AIR EA 4-55-194.

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