# SDR 97ZZZX4966

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N387HA
- Make and model: Cessna 550
- Registry model: [Cessna 550](https://openairdocs.org/model/cessna-550) (OpenAirDocs)
- Aircraft serial: 0465
- System (JASC): [5541 · Rudder, Spar/Rib](https://openairdocs.org/jasc/5541)
- Part: Rib
- Part number: 55331160
- Condition: Cracked
- Location: Rudder
- Part time: 5,921 hours
- 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/97ZZZX4966

## Discrepancy

UPON REMOVAL OF THE LEFT LOWER RUDDER CLOSEOUT SKIN, THE INTERSPAR RIB WAS FOUND CRACKED ACROSS THE ENTIRE WIDTH OF THE RIB.  THE DAMAGE TO THE RIB WAS A CLEAR INDICATION OF A CRACK CAUSED BY FATIGUE.  THE DECREASED INTEGRITY ALSO CAUSED THE ATTACHING RUDDER SKIN TO CRACK.

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