# SDR YENA2020011520017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2020
- Submitted: January 15, 2020
- Operation: Air carrier
- Aircraft: [N903JB](https://openairdocs.org/aircraft/N903JB), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 5783
- Aircraft time: 23,767 hours, 7,544 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 321431
- Part serial: 786376
- Condition: Discharged
- Location: Cabin
- Part time: 12,395 hours, 4,036 cycles
- 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/YENA2020011520017

## Discrepancy

DURING HEAVY MAINTENANCE, (REF WORK ORDER 2020-4/1) THE EMERGENCY POWER SUPPLY UNIT BATTERY AT AFT GALLEY AREA MUST BE REPLACED; REF WORK ORDER 2020-4/1, REMOVED AND REPLACED THE BATTERY OF THE AFT GALLEY EPSU (EMERGENCY POWER SUPPLY UNIT) 13WL IAW AMM 33-51-38-400-002-A AND PERFORMED OPERATIONAL TEST OF EPSU IAW AMM 33-51-00-710-001 AND TEST IS OK.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.