# SDR AALA202508084723

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2025
- Submitted: August 8, 2025
- Operation: Air carrier
- Aircraft: [N912UY](https://openairdocs.org/aircraft/N912UY), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6264
- Aircraft time: 35,305 hours, 14,567 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Slide
- Part number: D30664513
- Part serial: M21440
- Condition: Abnormal
- Location: Zone 800
- Part time: 11,945 hours, 5,329 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/AALA202508084723

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: AN OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM POWER SUPPLY UNITS PER AMM 33-51-00  PRODUCED THE FOLLOWING CLASS 1 MAINTENANCE MESSAGES: ESCAPE SLIDE LT/ EPSU (10WL) FWD L, EMER LT/ EPSU (10WL) FWD L, EXIT SIGNS/ EPSU (10WL) FWD L, FPEEPMS AISLE LT/ EPSU (10WL) FWD L, FPEEPMS CROSS ISLE LT/ EPSU (10WL) FWD L. MAINTENANCE REPLACED THE L1 DOOR SLIDE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM PER TASK CARD 26L00025010 AND AMM 33-51-00.

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