# SDR USAA2012091700038

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 14, 2012
- Submitted: September 17, 2012
- Operation: Air carrier
- Aircraft: [N521UW](https://openairdocs.org/aircraft/N521UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3944
- Aircraft time: 12,807 hours, 4,179 cycles
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Switch
- Part number: E0175B01E00
- Condition: Faulty
- Location: Electrical Sys
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2012091700038

## Discrepancy

OPERATIONAL CHECK OF EMERGENCY OPERATING SYSTEM FAILED.  "EMER GEN" IS AMBER - PARAMETERS ARE ZERO.  REMOVED AND REPLACED MICROSWITCH (2XE) IAW AIRBUS MAINTENANCE MANUAL.  ALSO CLEANED CONNECTORS ON CONSTANT SPEED MOTOR GENERATOR.

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