# SDR AALA202504175511

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 16, 2025
- Submitted: April 17, 2025
- Operation: Air carrier
- Aircraft: [N923US](https://openairdocs.org/aircraft/N923US), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6543
- Aircraft time: 32,072 hours, 13,025 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Filter
- Condition: Dirty
- Location: Zone 900
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202504175511

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: SMOKE/FUMES WARNING IN LAVATORY D IN FLIGHT WITH NO APPARENT SOURCE OF SMOKE/FUMES DETECTED. THE WARNING ILLUMINATED FOR APPROXIMATELY 40 SECONDS. MAINTENANCE FOUND THE FILTER ON SMOKE ALARM EXTREMELY DIRTY AND CLEANED IT.

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