# SDR AALA202102139002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 12, 2021
- Submitted: February 15, 2021
- Operation: Air carrier
- Aircraft: [N920US](https://openairdocs.org/aircraft/N920US), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6490
- Aircraft time: 18,892 hours, 7,317 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Condition: Dirty
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202102139002

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: DURING OPERATIONAL TEST OF THE EMERGENCY LIGHTS MULTI FUNCTION CONTROL DISPLAY UNIT SHOWS FAULT BATTERY/EMERGENCY POWER SUPPLY UNIT (14WL) MID RIGHT. PERFORMED THE VISUAL INSPECTION AND CLEANING OF THE BATTERY EMERGENCY POWER SUPPLY UNIT 14WL ON MID CABIN PER AMM 33-51-38-400-002-A.

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