# SDR AALA202603036368

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 2, 2026
- Submitted: March 3, 2026
- Operation: Air carrier
- Aircraft: [N970UY](https://openairdocs.org/aircraft/N970UY), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 3924
- Aircraft time: 55,504 hours, 21,169 cycles
- System (JASC): [5270 · Door Warning System](https://openairdocs.org/jasc/5270)
- Part: Deu
- Part number: Z043H000351A
- Part serial: 043H00011825
- Condition: Fault Message
- Location: Zone 200
- Part time: 50,638 hours, 19,043 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202603036368

## Discrepancy

AIRCRAFT WAS GROUNDED: 4L DOOR SLIDE BOTTLE PRESSURE INDICATES AMBER IN FLIGHT. MAINTENANCE FOUND FAULT MESSAGE FOR DECODER ENCODER UNIT (DEU-B, 300RH8) AND REPLACED IT PER AMM 23-73-47. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED.

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