# SDR YENA2023082200967

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 19, 2023
- Submitted: August 22, 2023
- Operation: Air carrier
- Aircraft: [N991JT](https://openairdocs.org/aircraft/N991JT), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 07994
- Aircraft time: 22,980 hours, 4,519 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- 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/YENA2023082200967

## Discrepancy

DURING HEAVY MAINTENANCE: INOP EMERGENCY POWER SUPPLY UNIT EPSU 10WL AT FWD GALLEY AREA (UNIT FAULT); REF AEROMAN WO 2023 282/1 NR 2023-463823.  REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT EPSU 10WL AT FWD GALLEY AREA IAW AMM 33-51-38-000-001-A, AMM 33-51-38-400-001-A STEP 1 THRU 4.F. TOOL USED MILLIOHMETER PN:97F92003500000, SN: BL5027, DUE DATE: JUN-22-2024.'

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