# SDR YENA2018053170229

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 27, 2018
- Submitted: May 31, 2018
- Operation: Air carrier
- Aircraft: [N948JB](https://openairdocs.org/aircraft/N948JB), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6560
- Aircraft time: 12,720 hours, 4,074 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: 321431
- Part serial: 777964
- Condition: Failed
- Location: 12wl
- Part time: 12,707 hours, 4,072 cycles
- 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/YENA2018053170229

## Discrepancy

DURING HEAVY MAINTENANCE, EPSU BATTERIES FAILED 11WL, 12WL, 13WL AND 14WL; REMOVED AND REPLACED EMERGENCY POWER UNIT IAW AMM 33-51-38-000-002-A.

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