# SDR AALA202411194101

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 2024
- Submitted: November 19, 2024
- Operation: Air carrier
- Aircraft: [N977UY](https://openairdocs.org/aircraft/N977UY), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 5409
- Aircraft time: 36,838 hours, 15,119 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 154232
- 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/AALA202411194101

## Discrepancy

AIRCRAFT WAS IN BASE MAINTENANCE: DID NOT PASS OPERATIONAL TEST OF EMERGENCY POWER SUPPLY UNITS BY BUILT IN TEST EQUIPMENT CHECK. PERFORMED FAULT CONFIRMATION AND FAULT ISOLATION PER TSM 33-51-00-810-822-A AND REPLACED POWER-EMERGENCY SUPPLY (10WL) PER AMM 33-51-38-400-001-A.

---
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.