# SDR AALA202307068154

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 4, 2023
- Submitted: July 6, 2023
- Operation: Air carrier
- Aircraft: [N155NN](https://openairdocs.org/aircraft/N155NN), registered now
- Make and model: Airbus A320*
- Aircraft serial: 6940
- Aircraft time: 22,319 hours, 8,690 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 143047
- Condition: No Test
- Location: Zone 200 - Fuse
- Part time: 4,637 hours, 1,968 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202307068154

## Discrepancy

AIRCRAFT WAS GROUNDED: WHILE ACCOMPLISHING EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK PER TASK CARD 26L00005005, EMERGENCY POWER SUPPLY UNIT 11WL FAULT MESSAGE DISPLAYED. REPLACED EMERGENCY POWER SUPPLY UNIT 11WL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.

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