# SDR DALA2026020800893

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 7, 2026
- Submitted: February 8, 2026
- Operation: Air carrier
- Aircraft: [N335DN](https://openairdocs.org/aircraft/N335DN), registered now
- Make and model: Airbus A321-213
- Registry model: [Airbus A321-213](https://openairdocs.org/model/airbus-a321-213) (OpenAirDocs)
- Aircraft serial: 8036
- Aircraft time: 24,943 hours, 11,155 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: Faulted
- Location: Zone 200
- 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/DALA2026020800893

## Discrepancy

FA REPORTS EMERGENCY LIGHTS TURNING ON AND OFF IN THE CABIN.   PERFORMED OPS CHKD EMERGENCY POWER SUPPLY UNITS BITE PER TSM 33-51-00-710-001-A. TEST FAULTS EPSU 13WL AFT L CLASS 1. 984478. REPLACED EPSU 13WL REF A321 AMM 33-51.SYS TEST NML. (LP 6871642)

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