# SDR AALA201801249005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 23, 2018
- Submitted: March 27, 2018
- Operation: Air carrier
- Aircraft: [N173US](https://openairdocs.org/aircraft/N173US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1481
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32145510
- Part serial: 2203
- Condition: No Test
- Location: Emergency Lights
- Part time: 57,611 hours, 21,572 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/AALA201801249005

## Discrepancy

DURING AN EMERGENCY LIGHT SYSTEM TEST, THE TEST FAILED WITH A MESSAGE FOR THE EMERGENCY POWER SUPPLY UNIT,  R3 DOOR.  REPLACED THE POWER SUPPLY UNIT AND BATTERY PACK IAW AMM 33-51-38.

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