# SDR USAA2013060700007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2013
- Submitted: August 15, 2013
- Operation: Air carrier
- Aircraft: [N193UW](https://openairdocs.org/aircraft/N193UW), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 3584
- Aircraft time: 16,733 hours, 6,107 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Fuse
- Part number: 77943573
- Part serial: 044275
- Condition: Inoperative
- Location: Emergency Light
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2013060700007

## Discrepancy

EMERGENCY POWER SUPPLY UNIT FAULT DURING EMERGENCY EXIT LIGHT TEST.  R & R ESPU IAW MM 33-51-38-401.  A BAD FUSE DETERMINTED TO BE ROOT CAUSE OF FAILURE.

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