# SDR CALA2026020413586

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2026
- Submitted: February 5, 2026
- Operation: Air carrier
- Aircraft: [N44501](https://openairdocs.org/aircraft/N44501), registered now
- Make and model: Airbus A321-271NX
- Registry model: [Airbus A321-271NX](https://openairdocs.org/model/airbus-s-a-s-a321-271nx) (OpenAirDocs)
- Aircraft serial: 11500
- Aircraft time: 6,080 hours, 2,195 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: AD321431
- Condition: No Test
- 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/CALA2026020413586

## Discrepancy

CIDS1 EPSU SYS TEST FAILED. CLASS 1, BAT/EPSU(16WL) OWD R.   REMOVED AND REPLACED 16WL EPSU BATTERY REF AMM 33-51-38-000-002-A AND 33-51-38-400-002-A. OPS TESTS GOOD. FAULT NO LONGER PRESENT.

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