# SDR YENA2022050300437

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 1, 2022
- Submitted: May 3, 2022
- Operation: Air carrier
- Aircraft: [N972JT](https://openairdocs.org/aircraft/N972JT), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 07455
- Aircraft time: 19,312 hours, 6,313 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: None
- Part number: 321431
- Part serial: 863257
- Condition: Failed
- Location: 10wl
- Part time: 3,512 hours, 1,086 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/YENA2022050300437

## Discrepancy

DURING HEAVY MAINTENANCE: FAULT EPSU EMERGENCY POWER SUPPLY UNIT SHOWED MESSAGE BAT/EPSU 10WL,11WL, AND 15WL IN THE PASSENGER CABIN; REF AEROMAN NR 2022-218602 WO 2022 117/1REMOVED AND REPLACED SERVICEABLE BATTERY EPSU IN POSITION 10WL P/N: 3214-31 S/N: 863257 AT FWD GALLEY AREA, 11WL  P/N: 3214-31 S/N: 885500 AFT LH MID-CABIN AND 15WL P/N: 3214-31 S/N: 873375 FWD LH MID CABIN IAW AMM 33-51-38-000-002-A AND AMM 33-51-38-400-002-A . PERFORMED OPERATIONAL TEST IAW AMM 33-51-00-710-001. THE TEST IS OK.

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