# SDR SWIA971859

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 29, 2000
- Submitted: July 12, 2000
- Operation: Air carrier
- Aircraft: [N393SW](https://openairdocs.org/aircraft/N393SW), registered now
- Make and model: Emb EMB-120ER
- Registry model: [EMB EMB-120ER](https://openairdocs.org/model/embraer-emb-120er) (OpenAirDocs)
- Aircraft serial: 120330
- Aircraft time: 8,573 hours, 12,600 cycles
- Engine: Pwa PW118A
- System (JASC): [2430 · DC Generating System](https://openairdocs.org/jasc/2430)
- Part: Rccb
- Condition: Malfunctioned
- Location: Electrical
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWIA971859

## Discrepancy

AFTER TAKEOFF AND GEAR UP A LOUD RAPID KNOCKING FROM UNDER NOSE OF AC INCREASE IN SPEED NOISE LOUDER ALONG WITH KNOCKING.  THE OPPOSITE EFFECT WITH DECREASE IN SPEED WITH GEAR DOWN NOISE AND KNOCKING STOPPED.  JACKED AC AND SWUNG GEAR,  FOUND GASPER FAN RCCB CLATTERING EXCESSIVELY.  NO DISCREPANCIES NOTED WITH GEAR SYSTEM.  OPS CHECKS GOOD ON GROUND.

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