# SDR AALA202508132370

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 12, 2025
- Submitted: August 13, 2025
- Operation: Air carrier
- Aircraft: [N778XF](https://openairdocs.org/aircraft/N778XF), registered now
- Make and model: Airbus A319-112
- Registry model: [Airbus A319-112](https://openairdocs.org/model/airbus-industrie-a319-112) (OpenAirDocs)
- Aircraft serial: 4127
- Aircraft time: 43,275 hours, 21,238 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: No Test
- Location: Zone 200
- 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/AALA202508132370

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: DURING PS CHECK EMER LT TEST, EPSU 12WL FAULTED.  MAINTENANCE REPLACED EPSU 12WL BATTERY IAW AMM 33-51-38.

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