# SDR AALA202306201685

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 20, 2023
- Submitted: June 20, 2023
- Operation: Air carrier
- Aircraft: [N542UW](https://openairdocs.org/aircraft/N542UW), registered now
- Make and model: Airbus A320*
- Aircraft serial: 4134
- Aircraft time: 45,318 hours, 17,015 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 133494
- Condition: No Test
- Location: Zone 200 - Fuse
- Part time: 45,317 hours, 17,015 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202306201685

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: DURING THE EMERGENCY LIGHT TEST THE EMERGENCY POWER SUPPLY UNIT (11WL) EXIT LEFT FLAGGED. REPLACED EMERGENCY POWER SUPPLY UNIT 11WL PER AMM 33-51-38-400-001-A.

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