# SDR CA051103004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 11, 2005
- Submitted: December 2, 2005
- Operation: General aviation
- Make and model: Beech B200
- Registry model: [Beech B200](https://openairdocs.org/model/beech-b200) (OpenAirDocs)
- Aircraft time: 17,006 hours
- Engine: Pwa PT6A42
- Propeller: Hartzl HCB3TN3
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Part number: 9744001967
- Condition: Cracked
- Location: Fuselage
- 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/CA051103004

## Discrepancy

(CAN) WEB CRACKED HORIZONTALLY APPROX. 10 INCHES. CRACK COINCIDES WITH FLANGE OF UNDERLYING Z CHANNEL. PROBLEM APPEARS TO BE RELATED TO POOR MANUFACTURING PRACTICES.  PRC SEALANT BEAD APPLIED TO Z CHANNEL FLANGE CURED BEFORE RIVETING. THE RESULT WAS THAT THE SEALANT BEAD CAUSED A STRESS RISER COMPOUNDED BY PRESSURIZATION LOADS ACCELERATING THE FATIGUE. THIS CONCLUSION WAS ARRIVED AT BY OBSERVING THAT THE CRACK EXACTLY CO-INSIDES WITH THE PATH OF THE SEALANT BEAD.

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